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  • 1.
    Aerts, Sven
    et al.
    Fundamenten van de Exacte WetenschappenVrije Universiteit Brussel, Triomflaan 21050 Brussel, Belgium.
    Kwiat, Paul
    P-23, MS-H803, Los Alamos National Laboratory, Los Alamos, New Mexico, USA.
    Larsson, Jan-Åke
    Linköping University, Department of Mathematics, Applied Mathematics. Linköping University, The Institute of Technology.
    Zukowski, Marek
    Instytut Fizyki Teoretycznej i Astrofizyki, Uniwersytet Gdańsk, iPL-80-952 Gdańsk, Poland.
    Comment on Two-photon Franson-type experiment and local realism - Reply2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 86, no 9, p. 1909-1909Article in journal (Refereed)
    Abstract [en]

    A Reply to the Comment by Carlos Luiz Ryff.

  • 2.
    Aerts, Sven
    et al.
    Fundamenten van de Exacte Wetenschappen, Vrije Universiteit Brussel, Brussel, Belgium.
    Kwiat, Paul
    Los Alamos National Laboratory, Los Alamos, New Mexico.
    Larsson, Jan-Åke
    Linköping University, Department of Mathematics. Linköping University, The Institute of Technology.
    Zukowski, Marek
    Instytut Fizyki Teoretycznej i Astrofizyki Uniwersytet Gdański, Gdańsk, Poland .
    Two-photon Franson-type experiments and local realism1999In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 83, no 15, p. 2872-2876Article in journal (Refereed)
    Abstract [en]

    The two-photon interferometric experiment proposed by J. D. Franson [Phys. Rev. Lett. 62, 2205 (1989)] is often treated as a “Bell test of local realism.” However, it has been suggested that this is incorrect due to the 50% postselection performed even in the ideal gedanken version of the experiment. Here we present a simple local hidden variable model of the experiment that successfully explains the results obtained in usual realizations of the experiment, even with perfect detectors. Furthermore, we also show that there is no such model if the switching of the local phase settings is done at a rate determined by the internal geometry of the interferometers.

  • 3.
    Aguilar, Edgar A.
    et al.
    Univ Gdansk, Poland.
    Farkas, Mate
    Univ Gdansk, Poland.
    Martinez, Daniel
    Univ Concepcion, Chile.
    Alvarado, Matias
    Univ Concepcion, Chile.
    Carine, Jaime
    Univ Concepcion, Chile.
    Xavier, Guilherme B
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering. Univ Concepcion, Chile.
    Barra, Johanna F.
    Univ Concepcion, Chile.
    Canas, Gustavo
    Univ Bio Bio, Chile.
    Pawlowski, Marcin
    Univ Gdansk, Poland.
    Lima, Gustavo
    Univ Concepcion, Chile.
    Certifying an Irreducible 1024-Dimensional Photonic State Using Refined Dimension Witnesses2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 120, no 23, article id 230503Article in journal (Refereed)
    Abstract [en]

    We report on a new class of dimension witnesses, based on quantum random access codes, which are a function of the recorded statistics and that have different bounds for all possible decompositions of a high-dimensional physical system. Thus, it certifies the dimension of the system and has the new distinct feature of identifying whether the high-dimensional system is decomposable in terms of lower dimensional subsystems. To demonstrate the practicability of this technique, we used it to experimentally certify the generation of an irreducible 1024-dimensional photonic quantum state. Therefore, certifying that the state is not multipartite or encoded using noncoupled different degrees of freedom of a single photon. Our protocol should find applications in a broad class of modern quantum information experiments addressing the generation of high-dimensional quantum systems, where quantum tomography may become intractable.

  • 4.
    Ahmed, Hamad
    et al.
    Queen's University Belfast, UK.
    Dieckmann, Mark Eric
    Queen's University Belfast, UK.
    Romagnani, Lorenzo
    Ecole Polytechnique, Palaiseau, France.
    Doria, Domenico
    Queen's University Belfast, UK.
    Sarri, Gianluca
    Queen's University Belfast.
    Cherchez, Mirelie
    University of Düsseldorf, Germany.
    Ianni, E.
    Universita di Pisa, Italy.
    Kourakis, Ioannis
    Queen's University Belfast, UK.
    Giesecke, Anna Lena
    University of Düsseldorf, Germany.
    Notley, Margaret
    Rutherford Appleton Laboratory, Chilton, Oxfordshire, UK.
    Prasad, R.
    Queen's University Belfast, UK.
    Quinn, Kevin
    Queen's University Belfast, UK.
    Willi, Oswald
    University of Düsseldorf, Germany.
    Borghesi, Marco
    Queen's University Belfast, UK.
    Time-Resolved Characterization of the Formation of a Collisionless Shock2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 20Article in journal (Refereed)
    Abstract [en]

    We report on the temporally and spatially resolved detection of the precursory stages that lead to the formation of an unmagnetized, supercritical collisionless shock in a laser-driven laboratory experiment. The measured evolution of the electrostatic potential associated with the shock unveils the transition from a current free double layer into a symmetric shock structure, stabilized by ion reflection at the shock front. Supported by a matching particle-in-cell simulation and theoretical considerations, we suggest that this process is analogous to ion reflection at supercritical collisionless shocks in supernova remnants.

  • 5.
    Alexander-Webber, J. A.
    et al.
    University of Oxford, England.
    Baker, A. M. R.
    University of Oxford, England.
    Janssen, T. J. B. M.
    National Phys Lab, England.
    Tzalenchuk, A
    National Phys Lab, England.
    Lara-Avila, S
    Chalmers, Sweden.
    Kubatkin, S
    Chalmers, Sweden.
    Yakimova, Rositsa
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Piot, B A.
    LNCMI CNRS UJF INSA UPS, France.
    Maude, D K.
    LNCMI CNRS UJF INSA UPS, France.
    Nicholas, R J.
    University of Oxford, England.
    Phase Space for the Breakdown of the Quantum Hall Effect in Epitaxial Graphene2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, no 9, p. e096601-Article in journal (Refereed)
    Abstract [en]

    We report the phase space defined by the quantum Hall effect breakdown in polymer gated epitaxial graphene on SiC (SiC/G) as a function of temperature, current, carrier density, and magnetic fields up to 30 T. At 2 K, breakdown currents (Ic) almost 2 orders of magnitude greater than in GaAs devices are observed. The phase boundary of the dissipationless state (ρxx=0) shows a [1-(T/Tc)2] dependence and persists up to Tc>45  K at 29 T. With magnetic field Ic was found to increase ∝B3/2 and TcB2. As the Fermi energy approaches the Dirac point, the ν=2 quantized Hall plateau appears continuously from fields as low as 1 T up to at least 19 T due to a strong magnetic field dependence of the carrier density.

  • 6.
    Amselem, E.
    et al.
    Department of Physics, Stockholm University, Sweden .
    Bourennane, M.
    Department of Physics, Stockholm University, Stockholm University, Sweden .
    Budroni, C.
    Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany .
    Cabello, A.
    Departamento de Física Aplicada II, Universidad de Sevilla, Spain .
    Guehne, O.
    Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany .
    Kleinmann, M.
    Naturwissenschaftlich-Technische Fakultät, Universität Siegen, Germany .
    Larsson, Jan-Åke
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, The Institute of Technology.
    Wiesniak, M.
    Institute of Theoretical Physics and Astrophysics, University of Gdańsk, Poland .
    Editorial Material: Comment on "State-Independent Experimental Test of Quantum Contextuality"2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 7, p. 1-1Article in journal (Other academic)
    Abstract [en]

    In this Comment we argue that the experiment describedin the recent Letter does not allow one to make con-clusions about contextuality. Our main criticism is that themeasurement of the observables as well as the preparationof the state manifestly depend on the chosen context.Contrary to that, contextuality is about the behavior ofthesamemeasurement device in different experimentalcontexts.

  • 7.
    Andersen, J.N.
    et al.
    Dept. of Synchrt. Radiation Research, Institute of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
    Balasubramanian, T.
    MAXLAB, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
    Almbladh, C.-O.
    Department of Theoretical Physics, Institute of Physics, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
    Johansson, Leif
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Nyholm, R.
    MAXLAB, Lund University, P.O. Box 118, S-221 00 Lund, Sweden.
    Strong phonon replicas in Be 1s photoemission spectra2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 86, no 19, p. 4398-4401Article in journal (Refereed)
    Abstract [en]

    Strong phonon replicas in Be 1s photoemission spectra were investigated. The fine structure caused by intrinsic excitation of a narrow band of optical phonons was discussed in the 1s photoemission proces. The excitations of the optical Be phonons in the photoemission process caused fine structures. It was found that the phonon replicas in Be metal were strong due to large size misfit between neutral and core-ionized Be.

  • 8.
    Andersson, G.
    et al.
    Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Burkert, Till
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Warnicke, P.
    Department of Engineering Sciences, Uppsala Universitet, Box 534, 75121 Uppsala, Sweden.
    Bjorck, M.
    Björck, M., Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Sanyal, B.
    Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Chacon, C.
    Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Zlotea, C.
    Department of Materials Chemistry, Uppsala Universitet, Box 538, 751-21 Uppsala, Sweden.
    Nordstrom, L.
    Nordström, L., Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Nordblad, P.
    Department of Engineering Sciences, Uppsala Universitet, Box 534, 75121 Uppsala, Sweden.
    Eriksson, O.
    Department of Physics, Uppsala Universitet, Box 530, 751-21 Uppsala, Sweden.
    Perpendicular magnetocrystalline anisotropy in tetragonally distorted Fe-Co alloys2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, no 3Article in journal (Refereed)
    Abstract [en]

    We report on the experimental realization of tetragonal Fe-Co alloys as a constituent of Fe0.36Co0.64/Pt superlattices with huge perpendicular magnetocrystalline anisotropy energy, reaching 210µeV/atom, and a saturation magnetization of 2.5µB/atom at 40 K, in qualitative agreement with theoretical predictions. At room temperature the corresponding values 150µeV/atom and 2.2µB/atom are achieved. This suggests that Fe-Co alloys with carefully chosen combinations of composition and distortion are good candidates for high-density perpendicular storage materials. © 2006 The American Physical Society.

  • 9.
    Armiento, Rickard
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Kümmel, Stephan
    Theoretische Physik IV, Universität Bayreuth, Bayreuth, Germany.
    Orbital Localization, Charge Transfer, and Band Gaps in Semilocal Density-Functional Theory2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 111, no 3, p. 036402-1-036402-5Article in journal (Refereed)
    Abstract [en]

    We derive an exchange energy functional of generalized gradient form with a corresponding potential that changes discontinuously at integer particle numbers. The functional is semilocal, yet incorporates key features that are connected to the derivative discontinuity of Kohn-Sham density-functional theory. We validate our construction for several paradigm systems and explain how it addresses central well-known deficiencies of antecedent semilocal methods, i.e., the description of charge transfer, properly localized orbitals, and band gaps. We find, e.g., an improved shell structure for atoms, eigenvalues that more closely correspond to ionization energies, and an improved description of band structure where localized states are lowered in energy.

  • 10.
    Bally, M
    et al.
    Chalmers.
    Gunnarsson, A
    Chalmers.
    Svensson, Lennart
    Linköping University, Department of Clinical and Experimental Medicine, Molecular Virology. Linköping University, Faculty of Health Sciences.
    Larson, G
    University of Gothenburg.
    Zhdanov, V P
    Chalmers.
    Hook, F
    Chalmers.
    Interaction of Single Viruslike Particles with Vesicles Containing Glycosphingolipids2011In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, no 18, p. 188103-Article in journal (Refereed)
    Abstract [en]

    Glycosphingolipids are involved in the first steps of virus-cell interaction, where they mediate specific recognition of the host cell membrane. We have employed total-internal-reflection fluorescence microscopy to explore the interaction kinetics between individual unlabeled noroviruslike particles, which are attached to a glycosphingolipid-containing lipid bilayer, and fluorescent vesicles containing different types and concentrations of glycosphingolipids. Under association equilibrium, the vesicle-binding rate is found to be kinetically limited, yielding information on the corresponding activation energy. The dissociation kinetics are logarithmic over a wide range of time. The latter is explained by the vesicle-size-related distribution of the dissociation activation energy. The biological, pharmaceutical, and diagnostic relevance of the study is briefly discussed.

  • 11.
    Battiato, M.
    et al.
    Nanyang Technol Univ, Singapore; Tech Univ Wien, Austria.
    Minar, J.
    Univ West Bohemia, Czech Republic.
    Wang, Weimin
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, Faculty of Science & Engineering.
    Ndiaye, W.
    Univ Cergy Pontoise, France.
    Richter, M. C.
    Univ Cergy Pontoise, France; CEA Saclay, France.
    Heckmann, O.
    Univ Cergy Pontoise, France; CEA Saclay, France.
    Mariot, J. -M.
    Sorbonne Univ, France; Synchrotron SOLEIL, France.
    Parmigiani, F.
    Univ Trieste, Italy; Elettra Sincrotrone Trieste SCpA, Italy; Univ Cologne, Germany.
    Hricovini, K.
    Univ Cergy Pontoise, France; CEA Saclay, France.
    Cacho, C.
    Diamond Light Source, England; Rutherford Appleton Lab, England.
    Distinctive Picosecond Spin Polarization Dynamics in Bulk Half Metals2018In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 121, no 7, article id 077205Article in journal (Refereed)
    Abstract [en]

    Femtosecond laser excitations in half-metal (HM) compounds are theoretically predicted to induce an exotic picosecond spin dynamics. In particular, conversely to what is observed in conventional metals and semiconductors, the thermalization process in HMs leads to a long living partially thermalized configuration characterized by three Fermi-Dirac distributions for the minority, majority conduction, and majority valence electrons, respectively. Remarkably, these distributions have the same temperature but different chemical potentials. This unusual thermodynamic state is causing a persistent nonequilibrium spin polarization only well above the Fermi energy. Femtosecond spin dynamics experiments performed on Fe3O4 by time- and spin-resolved photoelectron spectroscopy support our model. Furthermore, the spin polarization response proves to be very robust and it can be adopted to selectively test the bulk HM character in a wide range of compounds.

  • 12.
    Bechstedt, F.
    et al.
    Inst. Festkorpertheorie und -Optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany.
    Furthmuller, J.
    Furthmüller, J., Inst. Festkorpertheorie und -Optik, Friedrich-Schiller-Universität, Max-Wien-Platz 1, 07743 Jena, Germany.
    Ambacher, O.
    Technische Universität Ilmenau, Zentrum Mikro- und Nanotechnologien, G.-Kirchhoff-Strasse 7, 98693 Ilmenau, Germany.
    Goldhahn, R.
    Technische Universität Ilmenau, Institut für Physik, PF 10 05 65, 98684 Ilmenau, Germany.
    Shubina, T.V.
    Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russian Federation.
    Ivanov, S.V.
    Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russian Federation.
    Jmerik, V.N.
    Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russian Federation.
    Kop'ev, P.S.
    Ioffe Physico-Technical Institute, Polytekhnicheskaya 26, St. Petersburg 194021, Russian Federation.
    Vasson, A.
    LASMEA-UMR 6602, CNRS-UBP, 63177 Aubiere Cedex, France.
    Leymarie, J.
    LASMEA-UMR 6602, CNRS-UBP, 63177 Aubiere Cedex, France.
    Kavokin, A.
    LASMEA-UMR 6602, CNRS-UBP, 63177 Aubiere Cedex, France.
    Amano, H.
    Meijo University, 1-501 Shiogamaguchi, Tempaku-ku, Nagoya 468-8502, Japan.
    Gil, B.
    Université Montpellier II, 34095 Montpellier, France.
    Briot, O.
    Université Montpellier II, 34095 Montpellier, France.
    Monemar, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials.
    Comment on "Mie resonances, infrared emission, and the band gap of InN"2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 93, no 26 I, p. 269701-1p. 269701-1-Article in journal (Other academic)
    Abstract [en]

    [No abstract available]

  • 13.
    Bjorneholm, O.
    et al.
    Björneholm, O., Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Bassler, M.
    Bässler, M., Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Ausmees, A.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Hjelte, I.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Feifel, R.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Wang, H.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Miron, C.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Piancastelli, M.N.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden, Dept. of Chem. Sci. and Technologies, University Tor Vergata, 00133 Rome, Italy.
    Svensson, S.
    Department of Physics, Uppsala University, Box 530, S-751 21 Uppsala, Sweden.
    Sorensen, S.L.
    Dept. of Synchrt. Radiation Research, Institute of Physics, Lund University, 5-227 00 Lund, Sweden.
    Gel'mukhanov, F.
    Agren, H.
    Doppler splitting of in-flight auger decay of dissociating oxygen molecules: The localization of delocalized core holes2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, no 13, p. 2826-2829Article in journal (Refereed)
    Abstract [en]

    By exploiting the core-excitation-induced dissociation of O2, we find that the Auger emission exhibits a Doppler-like energy shift. We show this to be a manifestation of localization of the core hole and propose that the problem of core-hole localization versus delocalization in core-hole spectroscopies may be resolved by considering the nature of the measurement. © 2000 The American Physical Society.

  • 14.
    Bloom, F. L.
    et al.
    Eindhoven University of Technology, Netherlands.
    Kemerink, M.
    Eindhoven University of Technology, Netherlands.
    Wagemans, W.
    Eindhoven University of Technology, Netherlands.
    Koopmans, B.
    Eindhoven University of Technology, Netherlands.
    Sign Inversion of Magnetoresistance in Space-Charge Limited Organic Devices2009In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, no 6, article id 066601Article in journal (Refereed)
    Abstract [en]

    In this Letter, we explain the puzzling sign change of organic magnetoresistance in space-charge limited devices by device physics. We prove analytically and numerically that in the case of bipolar conduction with an Ohmic majority carrier and an injection limited minority carrier contact, a decrease in minority carrier mobility may give rise to an increase in the device current. It is shown that when the magnetic field acts to decrease the mobility of both carriers, a sign change in the magnetoconductivity as a function of applied bias may result. This behavior is in agreement with experimental observations.

  • 15.
    Bloom, F. L.
    et al.
    Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
    Wagemans, W.
    Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
    Kemerink, M.
    Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
    Koopmans, B.
    Eindhoven University of Technology, Netherlands; Eindhoven University of Technology, Netherlands.
    Separating positive and negative magnetoresistance in organic semiconductor devices2007In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 25, article id 257201Article in journal (Refereed)
    Abstract [en]

    We study the transition between positive and negative organic magnetoresistance (OMAR) in tris-(8 hydroxyquinoline) aluminium (Alq(3)), in order to identify the elementary mechanisms governing this phenomenon. We show how the sign of OMAR changes as function of the applied voltage and temperature. The transition from negative to positive magnetoresistance (MR) is found to be accompanied by an increase in slope of log(I) versus log(V). ac admittance measurements show this transition coincides with the onset of minority charge (hole) injection in the device. All these observations are consistent with two simultaneous contributions with opposite sign of MR, which may be assigned to holes and electrons having different magnetic field responses.

  • 16.
    Bobbert, PA
    et al.
    Eindhoven University of Technology, Netherlands.
    Kemerink, Martijn
    Eindhoven University of Technology, Netherlands.
    Koenraad, PM
    Eindhoven University of Technology, Netherlands.
    Density functional theory for holes in semiconductors1998In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 80, no 14, p. 3159-3159Article in journal (Refereed)
    Abstract [en]

    n/a

  • 17.
    Boström, Mathias
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
    Sernelius, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
    Thermal effects on the Casimir force in the 0.1-5 mu m range2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, no 20, p. 4757-4760Article in journal (Refereed)
    Abstract [en]

    The vacuum stresses between a metal half-space and a metal sphere were recently measured at room temperature, in the 0.6-6 mu m range, with an estimated accuracy of 5%. In the interpretation it was assumed that the accuracy was not good enough for observing any thermal effects. We claim that thermal effects are important in this separation range and back up this claim with numerical calculations of the Casimir force at zero temperature and at 300 K, based on tabulated optical data of gold, copper, and aluminum. The effects of dissipation and temperature are investigated and we demonstrate the importance of considering these two corrections together.

  • 18. Bulgakov, EN
    et al.
    Sadreev, Almas
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Vortex phase diagram of F=1 spinor Bose-Einstein condensates2003In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 90, no 20Article in journal (Refereed)
    Abstract [en]

    We have calculated the F=1 ground state of a spinor Bose-Einstein condensate trapped harmonic potential with an applied Ioffe-Pitchard magnetic field. The vortex phase diagram is found in the plane spanned by perpendicular and longitudinal magnetic fields. The ferromagnetic condensate has two vortex phases which differ by winding number in the spinor components. The two vortices for the F-z=-1 antiferromagnetic condensate are separated in space. Moreover, we considered an average local spin \[(S) over right arrow]\ to testify to what extent it is parallel to magnetic field (the nonadiabatic effects). We have shown that the effects are important at vortex cores.

  • 19.
    Burakovsky, L.
    et al.
    Los Alamos National Laboratory.
    Chen, S. P.
    Los Alamos National Laboratory.
    Preston, D. L.
    Los Alamos National Laboratory.
    Belonoshko, A. B.
    Royal Institute of Technology.
    Rosengren, A.
    Royal Institute of Technology.
    Mikhaylushkin, Arkady
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
    Simak, Sergey
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
    Moriarty, J. A.
    Lawrence Livermore National Laboratory.
    High-Pressure-High-Temperature Polymorphism in Ta: Resolving an Ongoing Experimental Controversy2010In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 104, no 25, p. 255702-Article in journal (Refereed)
    Abstract [en]

    Phase diagrams of refractory metals remain essentially unknown. Moreover, there is an ongoing controversy over the high-pressure melting temperatures of these metals: results of diamond anvil cell (DAC) and shock wave experiments differ by at least a factor of 2. From an extensive ab initio study on tantalum we discovered that the body-centered cubic phase, its physical phase at ambient conditions, transforms to another solid phase, possibly hexagonal omega phase, at high temperature. Hence the sample motion observed in DAC experiments is very likely not due to melting but internal stresses accompanying a solid-solid transformation, and thermal stresses associated with laser heating.

  • 20.
    Cabello, Adan
    et al.
    Departamento de Física Aplicada II, Universidad de Sevilla, Spain.
    Larsson, Jan-Åke
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Minimum Detection Efficiency for a Loophole-Free Atom-Photon Bell Experiment2007In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 98, p. 220402-1-220402-4, article id 220402Article in journal (Refereed)
    Abstract [en]

    In Bell experiments, one problem is to achieve high enough photodetection to ensure that there is no possibility of describing the results via a local hidden-variable model. Using the Clauser-Horne inequality and a two-photon nonmaximally entangled state, a photodetection efficiency higher than 0.67 is necessary. Here we discuss atom-photon Bell experiments. We show that, assuming perfect detection efficiency of the atom, it is possible to perform a loophole-free atom-photon Bell experiment whenever the photodetection efficiency exceeds 0.50.

  • 21.
    Calander, N
    et al.
    Chalmers University of Technology.
    Willander, Magnus
    Chalmers University of Technology.
    Optical trapping of single fluorescent molecules at the detection spots of nanoprobes2002In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 89, no 14Article in journal (Refereed)
    Abstract [en]

    We propose a scheme of optical trapping of fluorescent molecules, based on the strongly enhanced optical field due to surface plasmon resonances at laser illuminated metal tips or particles. A semiclassical approach is compared to a quantum-mechanical one. Attractive as well as repulsive forces are possible depending on the wavelength of the optical field. The trapping potential is shown to be strong enough to overcome the Brownian motion in water solution for common optical tweezer light inten-sities. Single molecule resonance Raman spectroscopy probes are particularly well suited for the trap-ping scheme. Finally we propose intracellular probing of the function of biomolecules as an application.

  • 22.
    Carvacho, Gonzalo
    et al.
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Carine, Jaime
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Saavedra, Gabriel
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Cuevas, Alvaro
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Fuenzalida, Jorge
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Toledo, Felipe
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Figueroa, Miguel
    University of Concepcion, Chile; University of Concepcion, Chile.
    Cabello, Adan
    University of Seville, Spain.
    Larsson, Jan-Åke
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Mataloni, Paolo
    University of Roma La Sapienza, Italy.
    Lima, Gustavo
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Xavier, Guilherme B.
    University of Concepcion, Chile; University of Concepcion, Chile; University of Concepcion, Chile.
    Postselection-Loophole-Free Bell Test Over an Installed Optical Fiber Network2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 3, p. 030503-Article in journal (Refereed)
    Abstract [en]

    Device-independent quantum communication will require a loophole-free violation of Bell inequalities. In typical scenarios where line of sight between the communicating parties is not available, it is convenient to use energy-time entangled photons due to intrinsic robustness while propagating over optical fibers. Here we show an energy-time Clauser-Horne-Shimony-Holt Bell inequality violation with two parties separated by 3.7 km over the deployed optical fiber network belonging to the University of Concepcion in Chile. Remarkably, this is the first Bell violation with spatially separated parties that is free of the postselection loophole, which affected all previous in-field long-distance energy-time experiments. Our work takes a further step towards a fiber-based loophole-free Bell test, which is highly desired for secure quantum communication due to the widespread existing telecommunication infrastructure.

  • 23.
    Chr Germs, W.
    et al.
    Eindhoven University of Technology, Netherlands.
    Guo, K.
    Eindhoven University of Technology, Netherlands.
    Janssen, R. A. J.
    Eindhoven University of Technology, Netherlands.
    Kemerink, M.
    Eindhoven University of Technology, Netherlands.
    Unusual Thermoelectric Behavior Indicating a Hopping to Bandlike Transport Transition in Pentacene2012In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 1, article id 016601Article in journal (Refereed)
    Abstract [en]

    An unusual increase in the Seebeck coefficient with increasing charge carrier density is observed in pentacene thin film transistors. This behavior is interpreted as being due to a transition from hopping transport in static localized states to bandlike transport, occurring at temperatures below similar to 250 K. Such a transition can be expected for organic materials in which both static energetic disorder and dynamic positional disorder are important. While clearly visible in the temperature and density dependent Seebeck coefficient, the transition hardly shows up in the charge carrier mobility.

  • 24.
    Dieckmann, Mark E
    Ruhr-University Bochum.
    Particle simulation of an ultra-relativistic two-stream instability2005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 94, no 155001Article in journal (Refereed)
  • 25.
    Dieckmann, Mark E
    Ruhr-University Bochum.
    Particle simulation of an ultrarelativistic two-stream instabilityx2005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 94, no 15, p. 155001-Article in journal (Refereed)
    Abstract [en]

    A two-stream instability in an unmagnetized plasma is examined by a particle-in-cell simulation. Each beam initially consists of cold electrons and protons that stream at a relative Lorentz factor 100. This is representative for plasma close to the external shocks of gamma-ray bursts. An electrostatic wave develops which saturates by trapping electrons. This wave collapses and the resulting electrostatic turbulence gives an electron momentum distribution that resembles a power law with a spectral break. Some electrons reach Lorentz factors over 1000. © 2005 The American Physical Society.

  • 26.
    Dieckmann, Mark E
    et al.
    Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
    Eliasson, B
    Stathopoulos, A
    Ynnerman, Anders
    Linköping University, Department of Science and Technology, Visual Information Technology and Applications (VITA). Linköping University, The Institute of Technology.
    Connecting shock velocities to electron-injection mechanisms2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, no 6Article in journal (Refereed)
    Abstract [en]

    Electrons can be accelerated by their interaction with nonlinearly saturated electrostatic waves up to speeds with which they can undergo diffusive acceleration across supernova remnant shocks. Here, we model this wave-electron interaction by particle-in-cell and Vlasov simulations. We find that the lifetime of the saturated wave is considerably longer in the Vlasov simulation, due to differences in how these simulation methods approximate the plasma. Electron surfing acceleration which requires a stable saturated wave may thus be more important for electron acceleration at shocks than previously thought. For beam speeds above a critical value, which we estimate here, both simulation codes exclude surfing acceleration due to a rapid wave collapse.

  • 27.
    Dubrovinskaia, N.
    et al.
    Universität Bayreuth, Germany.
    Dubrovinsky, L.
    Universität Bayreuth, Germany.
    Kantor, I
    Universität Bayreuth, Germany.
    Crichton, W.A.
    European Synchrotron Radiation Facility, Grenoble.
    Dmitriev, V.
    Swiss-Norwegian Beam Lines at ESRF, Grenoble.
    Prakapenka, V.
    University of Chicago, USA.
    Shen, G.
    University of Chicago.
    Vitros, L.
    Uppsala University, KTH, Stockholm.
    Ahuga, R.
    Uppsala University.
    Johansson, B.
    Uppsala University, KTH Stockholm.
    Abrikosov, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
    Beating the Miscibility Barrier Between Iron Group Elements and Magnesium by High-Pressure Alloying2005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 86, p. 245502-245513Article in journal (Refereed)
  • 28.
    Duda, L.-C.
    et al.
    Uppsala University.
    Schmitt, T.
    Uppsala University.
    Magnuson, Martin
    Uppsala University.
    Forsberg, J.
    Uppsala University.
    Olsson, A.
    Uppsala University.
    Nordgren, J.
    Uppsala University.
    Okada, K.
    Uppsala University.
    Kotani, A.
    Uppsala University.
    Reply to comment by Hüfner on "Resonant Inelastic X-Ray Scattering at the Oxygen K Resonance of NiO: Nonlocal Charge Transfer and Double-Singlet Excitations"2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 269702Article in journal (Other academic)
  • 29.
    Duda, L.-C.
    et al.
    Uppsala University.
    Schmitt, T.
    Uppsala University.
    Magnuson, Martin
    Uppsala University.
    Forsberg, J.
    Uppsala University.
    Olsson, A.
    Uppsala University.
    Nordgren, J.
    Uppsala University.
    Okada, K.
    Okayama University.
    Kotani, A.
    RIKEN/Spring8.
    Resonant Inelastic X-Ray Scattering at the Oxygen K Resonance of NiO: Nonlocal Charge Transfer and Double-Singlet Excitations2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 96, no 067402Article in journal (Refereed)
    Abstract [en]

    We report high-resolution polarization-dependent resonant inelastic x-ray scattering (RIXS) at the O K resonance of NiO showing a rich excitation spectrum. We perform multisite Ni6O19 cluster model calculations, revealing that solid state effects are substantial. We identify a nonlocal charge transfer excitation at 4–5 eV and double-singlet creation at 1.75 eV, both exhibiting significant scattering geometry dependence. Apart from an intense band of local charge transfer excitations (above 5 eV) also dd excitations at 1 eV are observed. Finally, we point out that O K RIXS of correlated metal oxides allows a quantitative and consistent determination of the charge transfer energy and the Hund coupling energy JH.

  • 30.
    Dupertuis, M A
    et al.
    Ecole Polytech Fed Lausanne.
    Karlsson, Fredrik
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Oberli, D Y
    Ecole Polytech Fed Lausanne.
    Pelucchi, E
    Ecole Polytech Fed Lausanne.
    Rudra, A
    Ecole Polytech Fed Lausanne.
    Holtz, Per-Olof
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Kapon, E
    Ecole Polytech Fed Lausanne.
    Symmetries and the Polarized Optical Spectra of Exciton Complexes in Quantum Dots2011In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 107, no 12, p. 127403-Article in journal (Refereed)
    Abstract [en]

    A systematic and simple theoretical approach is proposed to analyze true degeneracies and polarized decay patterns of exciton complexes in semiconductor quantum dots. The results provide reliable spectral signatures for efficient symmetry characterization, and predict original features for low C(2 nu) and high C(3 nu) symmetries. Excellent agreement with single quantum dot spectroscopy of real pyramidal InGaAs/AlGaAs quantum dots grown along [111] is demonstrated. The high sensitivity of biexciton quantum states to exact high symmetry can be turned into an efficient uninvasive postgrowth selection procedure for quantum entanglement applications.

  • 31.
    Ekholm, Marcus
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Zapolsky, H
    University of Rouen.
    Ruban, A V
    Royal Institute of Technology.
    Vernyhora, I
    University of Rouen.
    Ledue, D
    University of Rouen.
    Abrikosov, Igor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Influence of the Magnetic State on the Chemical Order-Disorder Transition Temperature in Fe-Ni Permalloy2010In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 105, no 16, p. 167208-Article in journal (Refereed)
    Abstract [en]

    In magnetic alloys, the effect of finite temperature magnetic excitations on phase stability below the Curie temperature is poorly investigated, although many systems undergo phase transitions in this temperature range. We consider random Ni-rich Fe-Ni alloys, which undergo chemical order-disorder transition approximately 100 K below their Curie temperature, to demonstrate from ab initio calculations that deviations of the global magnetic state from ideal ferromagnetic order due to temperature induced magnetization reduction have a crucial effect on the chemical transition temperature. We propose a scheme where the magnetic state is described by partially disordered local magnetic moments, which in combination with Heisenberg Monte Carlo simulations of the magnetization allows us to reproduce the transition temperature in good agreement with experimental data.

  • 32.
    Eklund, Per
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Dahlqvist, Martin
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Tengstrand, Olof
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Hultman, Lars
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Lu, Jun
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Nedfors, Nils
    Uppsala University, Sweden .
    Jansson, Ulf
    Uppsala University, Sweden .
    Rosén, Johanna
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Discovery of the Ternary Nanolaminated Compound Nb2GeC by a Systematic Theoretical-Experimental Approach2012In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 109, no 3, p. 035502-Article in journal (Refereed)
    Abstract [en]

    Since the advent of theoretical materials science some 60 years ago, there has been a drive to predict and design new materials in silicio. Mathematical optimization procedures to determine phase stability can be generally applicable to complex ternary or higher-order materials systems where the phase diagrams of the binary constituents are sufficiently known. Here, we employ a simplex-optimization procedure to predict new compounds in the ternary Nb-Ge-C system. Our theoretical results show that the hypothetical Nb2GeC is stable, and excludes all reasonably conceivable competing hypothetical phases. We verify the existence of the Nb2GeC phase by thin film synthesis using magnetron sputtering. This hexagonal nanolaminated phase has a and c lattice parameters of similar to 3.24 angstrom and 12.82 angstrom.

  • 33.
    Faber, Felix A.
    et al.
    Department of Chemistry, University of Basel, Switzerland.
    Lindmaa, Alexander
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    von Lilienfeld, O. Anatole
    Department of Chemistry, University of Basel, Switzerland.
    Armiento, Rickard
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    Machine Learning Energies of 2 Million Elpasolite (AB2D6) Crystals2016In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, ISSN 031-9007, Vol. 117, no 13, article id 135502Article in journal (Refereed)
    Abstract [en]

    Elpasolite is the predominant quaternary crystal structure (AlNaK2F6 prototype) reported in the Inorganic Crystal Structure Database. We develop a machine learning model to calculate density functional theory quality formation energies of all ∼2×106 pristine ABC2D6 elpasolite crystals that can be made up from main-group elements (up to bismuth). Our model’s accuracy can be improved systematically, reaching a mean absolute error of 0.1  eV/atom for a training set consisting of 10×103 crystals. Important bonding trends are revealed: fluoride is best suited to fit the coordination of the D site, which lowers the formation energy whereas the opposite is found for carbon. The bonding contribution of the elements A and B is very small on average. Low formation energies result from A and B being late elements from group II, C being a late (group I) element, and D being fluoride. Out of 2×106 crystals, 90 unique structures are predicted to be on the convex hull—among which is NFAl2Ca6, with a peculiar stoichiometry and a negative atomic oxidation state for Al.

  • 34.
    Falk, Abram L.
    et al.
    University of Chicago, IL 60637 USA University of Calif Santa Barbara, CA 93106 USA .
    Klimov, Paul V.
    University of Chicago, IL 60637 USA University of Calif Santa Barbara, CA 93106 USA .
    Buckley, Bob B.
    University of Calif Santa Barbara, CA 93106 USA .
    Ivády, Viktor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Abrikosov, Igor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Calusine, Greg
    University of Calif Santa Barbara, CA 93106 USA .
    Koehl, William F.
    University of Chicago, IL 60637 USA University of Calif Santa Barbara, CA 93106 USA .
    Gali, Adam
    Hungarian Academic Science, Hungary Budapest University of Technology and Econ, Hungary .
    Awschalom, David D.
    University of Chicago, IL 60637 USA University of Calif Santa Barbara, CA 93106 USA .
    Electrically and Mechanically Tunable Electron Spins in Silicon Carbide Color Centers2014In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 112, no 18, p. 187601-Article in journal (Refereed)
    Abstract [en]

    The electron spins of semiconductor defects can have complex interactions with their host, particularly in polar materials like SiC where electrical and mechanical variables are intertwined. By combining pulsed spin resonance with ab initio simulations, we show that spin-spin interactions in 4H-SiC neutral divacancies give rise to spin states with a strong Stark effect, sub-10(-6) strain sensitivity, and highly spin-dependent photoluminescence with intensity contrasts of 15%-36%. These results establish SiC color centers as compelling systems for sensing nanoscale electric and strain fields.

  • 35.
    Falk, Abram L.
    et al.
    University of Chicago, IL 60637 USA; IBM TJ Watson Research Centre, NY 10598 USA.
    Klimov, Paul V.
    University of Chicago, IL 60637 USA; University of Calif Santa Barbara, CA 93106 USA; Hungarian Academic Science, Hungary.
    Ivády, Viktor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering. Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Hungary.
    Szasz, Krisztian
    Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Hungary; Eotvos Lorand University, Hungary.
    Christle, David J.
    University of Chicago, IL 60637 USA; University of Calif Santa Barbara, CA 93106 USA; Hungarian Academic Science, Hungary.
    Koehl, William F.
    University of Chicago, IL 60637 USA.
    Gali, Adam
    Institute for Solid State Physics and Optics, Wigner Research Centre for Physics, Hungarian Academy of Sciences, Hungary; Budapest University of Technology and Econ, Hungary.
    Awschalom, David D.
    University of Chicago, IL 60637 USA.
    Optical Polarization of Nuclear Spins in Silicon Carbide2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 24, p. 247603-Article in journal (Refereed)
    Abstract [en]

    We demonstrate optically pumped dynamic nuclear polarization of Si-29 nuclear spins that are strongly coupled to paramagnetic color centers in 4H- and 6H-SiC. The 99% +/- 1% degree of polarization that we observe at room temperature corresponds to an effective nuclear temperature of 5 mu K. By combining ab initio theory with the experimental identification of the color centers optically excited states, we quantitatively model how the polarization derives from hyperfine-mediated level anticrossings. These results lay a foundation for SiC-based quantum memories, nuclear gyroscopes, and hyperpolarized probes for magnetic resonance imaging.

  • 36.
    Gali, Adam
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Aradi, B
    Tech Univ Budapest, Dept Atom Phys, H-1111 Budapest, Hungary Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Deak, P
    Tech Univ Budapest, Dept Atom Phys, H-1111 Budapest, Hungary Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Choyke, WJ
    Tech Univ Budapest, Dept Atom Phys, H-1111 Budapest, Hungary Univ Pittsburgh, Dept Phys & Astron, Pittsburgh, PA 15260 USA Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Nguyen, Tien Son
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Overcoordinated hydrogens in the carbon vacancy: Donor centers of SiC2000In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 84, no 21, p. 4926-4929Article in journal (Refereed)
    Abstract [en]

    Epitaxial silicon carbide is likely to contain hydrogen and vacancies (V), therefore, V + nH complexes are likely to influence its electronic properties. Using ob initio calculations we show that neutral and positive H atoms are trapped by carbon vacancies (V-C) in three-center bonds with two Si neighbors. The double positive charge state of V-C + H is not stable in equilibrium and in the triply positive state H binds only to one of the Si neighbors. At most two H atoms can be accommodated by a single V-C. The V-C + nH complexes have donor character and exhibit rather atypical vibration modes for Si-H bonds. Occupation levels and spin distributions were calculated and compared fur V-C + H and V-C.

  • 37.
    Gao, Feng
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology. University of Cambridge, England.
    Tress, Wolfgang
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
    Wang, Jianpu
    University of Cambridge, England; Nanjing Technical University, Peoples R China; Nanjing Technical University, Peoples R China.
    Inganäs, Olle
    Linköping University, Department of Physics, Chemistry and Biology, Biomolecular and Organic Electronics. Linköping University, The Institute of Technology.
    Temperature Dependence of Charge Carrier Generation in Organic Photovoltaics2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 114, no 12, p. 128701-Article in journal (Refereed)
    Abstract [en]

    The charge generation mechanism in organic photovoltaics is a fundamental yet heavily debated issue. All the generated charges recombine at the open-circuit voltage (VOC), so that investigation of recombined charges at VOC provides a unique approach to understanding charge generation. At low temperatures, we observe a decrease of VOC, which is attributed to reduced charge separation. Comparison between benchmark polymer: fullerene and polymer: polymer blends highlights the critical role of charge delocalization in charge separation and emphasizes the importance of entropy in charge generation.

  • 38.
    Giustina, Marissa
    et al.
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Versteegh, Marijn A. M.
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Wengerowsky, Soeren
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Handsteiner, Johannes
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Hochrainer, Armin
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Phelan, Kevin
    Austrian Academic Science, Austria.
    Steinlechner, Fabian
    Austrian Academic Science, Austria.
    Kofler, Johannes
    Max Planck Institute Quantum Opt, Germany.
    Larsson, Jan-Åke
    Linköping University, Department of Electrical Engineering, Information Coding. Linköping University, Faculty of Science & Engineering.
    Abellan, Carlos
    Barcelona Institute Science and Technology, Spain.
    Amaya, Waldimar
    Barcelona Institute Science and Technology, Spain.
    Pruneri, Valerio
    Barcelona Institute Science and Technology, Spain; ICREA, Spain.
    Mitchell, Morgan W.
    Barcelona Institute Science and Technology, Spain; ICREA, Spain.
    Beyer, Joern
    Phys Technical Bundesanstalt, Germany.
    Gerrits, Thomas
    NIST, CO 80305 USA.
    Lita, Adriana E.
    NIST, CO 80305 USA.
    Shalm, Lynden K.
    NIST, CO 80305 USA.
    Woo Nam, Sae
    NIST, CO 80305 USA.
    Scheidl, Thomas
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Ursin, Rupert
    Austrian Academic Science, Austria.
    Wittmann, Bernhard
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Zeilinger, Anton
    Austrian Academic Science, Austria; University of Vienna, Austria.
    Significant-Loophole-Free Test of Bells Theorem with Entangled Photons2015In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 115, no 25, p. 250401-Article in journal (Refereed)
    Abstract [en]

    Local realism is the worldview in which physical properties of objects exist independently of measurement and where physical influences cannot travel faster than the speed of light. Bells theorem states that this worldview is incompatible with the predictions of quantum mechanics, as is expressed in Bells inequalities. Previous experiments convincingly supported the quantum predictions. Yet, every experiment requires assumptions that provide loopholes for a local realist explanation. Here, we report a Bell test that closes the most significant of these loopholes simultaneously. Using a well-optimized source of entangled photons, rapid setting generation, and highly efficient superconducting detectors, we observe a violation of a Bell inequality with high statistical significance. The purely statistical probability of our results to occur under local realism does not exceed 3.74 x 10(-31), corresponding to an 11.5 standard deviation effect.

  • 39.
    Glazyrin, K.
    et al.
    Bayerisches Geoinstitut, Universität Bayreuth, Germany.
    Pourovskii, L.
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Dubrovinsky, L.
    Bayerisches Geoinstitut, Universität Bayreuth, Germany.
    Narygina, O.
    School of Physics and Astronomy, University of Edinburgh, Edinburgh, UK.
    McCammon, C.
    Bayerisches Geoinstitut, Universität Bayreuth, Germany.
    Hewener, B.
    Technische Universität Kaiserslautern, Kaiserslautern, Germany.
    Schünemann, V.
    Technische Universität Kaiserslautern, Kaiserslautern, Germany.
    Wolny, J.
    Technische Universität Kaiserslautern, Kaiserslautern, Germany.
    Muffler, K.
    Technische Universität Kaiserslautern, Kaiserslautern, Germany.
    Chumakov, A. I.
    ESRF, Grenoble Cedex, France.
    Crichton, W.
    ESRF, Grenoble Cedex, France.
    Hanfland, M.
    ESRF, Grenoble Cedex, France.
    Prakapenka, V.
    GeoSoilEnviroCARS, University of Chicago, Argonne National Laboratory, USA.
    Tasnádi, Ferenc
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Ekholm, Marcus
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Aichhorn, M.
    Centro Atómico Constituyentes, GIyANN, CNEA, San Martin, Buenos Aires, Comisión Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina.
    Vildosola, V.
    Centro Atómico Constituyentes, GIyANN, CNEA, San Martin, Buenos Aires, Comisión Nacional de Investigaciones Científicas y Técnicas, Ciudad de Buenos Aires, Argentina.
    Ruban, A. V.
    12Department of Materials Science and Engineering, Royal Institute of Technology, Stockholm, Sweden.
    Katsnelson, M. I.
    Radboud University Nijmegen, Institute for Molecules and Materials, Netherlands.
    Abrikosov, Igor
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Importance of correlation effects in hcp iron revealed by a pressure-induced electronic topological transition2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110, no 11Article in journal (Refereed)
    Abstract [en]

    We discover that hcp phases of Fe and Fe0.9Ni0.1 undergo an electronic topological transition at pressures of about 40 GPa. This topological change of the Fermi surface manifests itself through anomalous behavior of the Debye sound velocity, c/a lattice parameter ratio, and Mossbauer center shift observed in our experiments. First-principles simulations within the dynamic mean field approach demonstrate that the transition is induced by many-electron effects. It is absent in one-electron calculations and represents a clear signature of correlation effects in hcp Fe. DOI: 10.1103/PhysRevLett.110.117206

  • 40.
    Grigoriev, A.
    et al.
    Dept of Physics Uppsala University.
    Skorodumova, N.V.
    Dept ofh Physics Uppsala University.
    Simak, Sergey
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
    Wendin, G.
    Dept of Microtechnology and Nanoscience-MC2 Chalmers University, Göteborg.
    Johansson, B.
    Dept of Physics Uppsala University.
    Ahuja, R.
    Dept of Physics Uppsala University.
    Electron Transport in Stretched Monoatomic Gold Wires2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, p. 236807-1-236807-4Article in journal (Refereed)
  • 41.
    Gueorguiev, Gueorgui Kostov
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
    Pacheco, J. M.
    Tomanek, D.
    Quantum Size Effects in the Polarizability of Carbon Fullerenes2004In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 92, p. 215501-215504Article in journal (Refereed)
  • 42.
    Hallam, Toby
    et al.
    University of Cambridge, England.
    Lee, MiJung
    University of Cambridge, England.
    Zhao, Ni
    University of Cambridge, England.
    Nandhakumar, Iris
    University of Southampton, England.
    Kemerink, Martijn
    University of Cambridge, England; Eindhoven University of Technology, Netherlands.
    Heeney, Martin
    University of London Imperial Coll Science Technology and Med, England.
    McCulloch, Iain
    University of London Imperial Coll Science Technology and Med, England.
    Sirringhaus, Henning
    University of Cambridge, England.
    Local Charge Trapping in Conjugated Polymers Resolved by Scanning Kelvin Probe Microscopy2009In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 103, no 25, article id 256803Article in journal (Refereed)
    Abstract [en]

    The microstructure of conjugated polymers is heterogeneous on the length scale of individual polymer chains, but little is known about how this affects their electronic properties. Here we use scanning Kelvin probe microscopy with resolution-enhancing carbon nanotube tips to study charge transport on a 100 nm scale in a chain-extended, semicrystalline conjugated polymer. We show that the disordered grain boundaries between crystalline domains constitute preferential charge trapping sites and lead to variations on a 100 nm scale of the carrier concentration under accumulation conditions.

  • 43.
    Hellman, Olle
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Skorodumova, N V
    Royal Institute Technology.
    Simak, Sergey
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Charge Redistribution Mechanisms of Ceria Reduction2012In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 108, no 13, p. 135504-Article in journal (Refereed)
    Abstract [en]

    Charge redistribution at low oxygen vacancy concentrations in ceria have been studied in the framework of the density functional theory. We propose a model to approach the dilute limit using the results of supercell calculations. It allows one to reproduce the characteristic experimentally observed behavior of composition versus oxygen pressure dependency. We show that in the dilute limit the charge redistribution is likely to be driven by a mechanism different from the one involving electron localization on cerium atoms. We demonstrate that it can involve charge localization on light element impurities.

  • 44. Hjort, M
    et al.
    Stafström, Sven
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Computational Physics .
    Band resonant tunneling in DNA molecules2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 87, no 22, p. art. no.-228101Article in journal (Refereed)
    Abstract [en]

    The charge migration process in DNA is subject to a lively debate among researchers at the moment, We have performed calculations on poly(G)-poly(C) DNA which substantiate a recent report indicating bandlike conduction for this particular form of DNA. Our results show that both guanine and cytosine give rise to conducting channels along the DNA strands. The conductivity results from the overlap of the pi orbitals along the base stacks. We also demonstrate that the measured increase of the threshold voltage with temperature in poly(G)-poly(C) DNA is the result of electron localization due to the structural disorder following high temperature.

  • 45.
    Holmstrom, E.
    et al.
    Holmström, E., Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States.
    Olovsson, W.
    Department of Materials Science and Engineering, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
    Abrikosov, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .
    Niklasson, A.M.N.
    Theoretical Division, Los Alamos National Laboratory, Los Alamos, NM 87545, United States, Department of Materials Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden.
    Johansson, B.
    Department of Materials Science and Engineering, Royal Institute of Technology, SE-100 44 Stockholm, Sweden, Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden.
    Gorgoi, M.
    BESSY, Berlin, Germany.
    Karis, O.
    Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden.
    Svensson, S.
    Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden, BESSY, Berlin, Germany.
    Schafers, F.
    Schäfers, F., BESSY, Berlin, Germany.
    Braun, W.
    BESSY, Berlin, Germany.
    Ohrwall, G.
    Öhrwall, G., Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden.
    Andersson, G.
    Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden.
    Marcellini, M.
    Department of Physics, Uppsala University, SE-751 21 Uppsala, Sweden.
    Eberhardt, W.
    BESSY, Berlin, Germany.
    Sample preserving deep interface characterization technique2006In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 97, no 26Article in journal (Refereed)
    Abstract [en]

    We propose a nondestructive technique based on atomic core-level shifts to characterize the interface quality of thin film nanomaterials. Our method uses the inherent sensitivity of the atomic core-level binding energies to their local surroundings in order to probe the layer-resolved binary alloy composition profiles at deeply embedded interfaces. From an analysis based upon high energy x-ray photoemission spectroscopy and density functional theory of a Ni/Cu fcc (100) model system, we demonstrate that this technique is a sensitive tool to characterize the sharpness of a buried interface. We performed controlled interface tuning by gradually approaching the diffusion temperature of the multilayer, which lead to intermixing. We show that core-level spectroscopy directly reflects the changes in the electronic structure of the buried interfaces, which ultimately determines the functionality of the nanosized material. © 2006 The American Physical Society.

  • 46.
    Holzel, R
    et al.
    Fraunhofer Inst Biomed Engn.
    Calander, N
    Göteborg University and Chalmers University of Technology.
    Chiragwandi, Z
    Göteborg University and Chalmers University of Technology.
    Willander, Magnus
    Göteborg University and Chalmers University of Technology.
    Bier, FF
    Fraunhofer Inst Biomed Engn.
    Trapping single molecules by dielectrophoresis2005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 95, no 12Article in journal (Refereed)
    Abstract [en]

    We have trapped single protein molecules of R-phycoerythrin in an aqueous solution by an alternating electric field. A radio frequency voltage is applied to sharp nanoelectrodes and hence produces a strong electric field gradient. The resulting dielectrophoretic forces attract freely diffusing protein molecules. Trapping takes place at the electrode tips. Switching off the field immediately releases the molecules. The electric field distribution is computed, and from this the dielectrophoretic response of the molecules is calculated using a standard polarization model. The resulting forces are compared to the impact of Brownian motion. Finally, we discuss the experimental observations on the basis of the model calculations.

  • 47.
    Hultman, Lars
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
    Stafström, Sven
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Computational Physics .
    Czigany, Z
    Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Meijo Univ, Dept Phys, Japan Sci & Technol Corp, Nagoya, Aichi 4688502, Japan Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France Univ Paris 11, Aime Cotton Lab, F-91405 Orsay, France.
    Neidhardt, Jörg
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics.
    Hellgren, N
    Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Meijo Univ, Dept Phys, Japan Sci & Technol Corp, Nagoya, Aichi 4688502, Japan Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France Univ Paris 11, Aime Cotton Lab, F-91405 Orsay, France.
    Brunell, IF
    Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Meijo Univ, Dept Phys, Japan Sci & Technol Corp, Nagoya, Aichi 4688502, Japan Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France Univ Paris 11, Aime Cotton Lab, F-91405 Orsay, France.
    Suenaga, K
    Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Meijo Univ, Dept Phys, Japan Sci & Technol Corp, Nagoya, Aichi 4688502, Japan Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France Univ Paris 11, Aime Cotton Lab, F-91405 Orsay, France.
    Colliex, C
    Linkoping Univ, Dept Phys, S-58183 Linkoping, Sweden Univ Illinois, Frederick Seitz Mat Res Lab, Urbana, IL 61801 USA Meijo Univ, Dept Phys, Japan Sci & Technol Corp, Nagoya, Aichi 4688502, Japan Univ Paris 11, Phys Solides Lab, F-91405 Orsay, France Univ Paris 11, Aime Cotton Lab, F-91405 Orsay, France.
    Cross-linked nano-onions of carbon nitride in the solid phase: Existence of a novel C48N12 aza-fullerene2001In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 87, no 22, p. art. no.-225503Article in journal (Refereed)
    Abstract [en]

    We report a new fullerenelike material consisting of cross-linked nano-onions of C and N. Growth of the onion shells takes place atom by atom on a substrate surface and yields thin solid films during magnetron sputter deposition. Electron microscopy and energy loss spectroscopy show that the core shell contains up to 20 at. % N corresponding to C48N12 aza-fullerene composition. Nanoindentation of this nanostructured material gives high resilience with hardness 7 GPa, Young's modulus 37 GPa, and complete elastic recovery after loading with 0.5 mN to a depth of 75 nm. Total energy calculations show the stability Of C60-2nN2n aza-fullerenes and suggest the existence of a novel C48N12 molecule.

  • 48.
    Hunter Dunn, J.
    et al.
    MAX-Lab, Lund.
    Karis, O.
    MAX-lab, Lund.
    Andersson, C.
    Uppsala University.
    Arvanitis, D.
    Uppsala University.
    Carr, R.
    Stanford Synchrotron Radiation Laboratory, SLAC, USA.
    Abrikosov, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics.
    Sanyal, B.
    Uppsala University.
    Bergqvist, L.
    Uppsala University.
    Eriksson, O.
    Uppsala University.
    Vanishing Magnetic Interactions in Ferromagnetic Thin Films2005In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 94, p. 217202-1-217202-5Article in journal (Refereed)
  • 49.
    Ihnatsenka, Siarhei
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Zozoulenko, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Effect of electron interaction on statistics of conductance oscillations in open quantum dots: Does the dephasing time saturate?2007In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 99, no 16Article in journal (Refereed)
    Abstract [en]

    We perform self-consistent quantum transport calculations in open quantum dots taking into account the effect of electron interaction. We demonstrate that, in the regime of the ultralow temperatures 2pkBT? (? being the mean-level spacing), the electron interaction strongly smears the conductance oscillations and thus significantly affects their statistics. Our calculations are in good quantitative agreement with the observed ultralow temperature statistics of Huibers et al.. Our findings question a conventional interpretation of the ultralow temperature saturation of the coherence time in open dots which is based on the noninteracting theories, where the agreement with the experiment is achieved by introducing additional phenomenological channels of dephasing. © 2007 The American Physical Society.

  • 50.
    Ingason, Arni Sigurdur
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Mockuté, Aurelija
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Dahlqvist, Martin
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Magnus, F.
    Science Institute, University of Iceland, Reykjavik, Iceland.
    Olafsson, S.
    Science Institute, University of Iceland, Reykjavik, Iceland.
    Arnalds, U. B.
    Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
    Alling, Björn
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Abrikosov, Igor A.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Hjörvarsson, B.
    Department of Physics and Astronomy, Uppsala University, Uppsala, Sweden.
    Persson, Per O A
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Rosén, Johanna
    Linköping University, Department of Physics, Chemistry and Biology, Thin Film Physics. Linköping University, The Institute of Technology.
    Magnetic Self-Organized Atomic Laminate from First Principles and Thin Film Synthesis2013In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 110Article in journal (Refereed)
    Abstract [en]

    he first experimental realization of a magnetic Mn+1AXn (MAX) phase, (Cr0.75Mn0.25)2GeC, is presented, synthesized as a heteroepitaxial single crystal thin film, exhibiting excellent structural quality. This self-organized atomic laminate is based on the well-known Cr2GeC, with Mn, a new element in MAX phase research, substituting Cr. The compound was predicted using first-principles calculations, from which a variety of magnetic behavior is envisaged, depending on the Mn concentration and Cr/Mn atomic configuration within the sublattice. The analyzed thin films display a magnetic signal at room temperature.

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