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  • 1.
    Brodin, G.
    et al.
    Umeå University, Sweden.
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    A simple electron plasma wave2017In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 381, no 11, p. 1033-1035Article in journal (Refereed)
    Abstract [en]

    Considering a class of solutions where the density perturbations are functions of time, but not of space, we derive a new exact large amplitude wave solution for a cold uniform electron plasma. This result illustrates that most simple analytical solutions can appear even if the density perturbations are large. (C) 2016 Elsevier B.V. All rights reserved.

  • 2.
    Brodin, G.
    et al.
    Umeå University, Sweden .
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Large amplitude electron plasma oscillations2014In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 378, no 22-23, p. 1632-1635Article in journal (Refereed)
    Abstract [en]

    We consider a cold plasma in order to find new large-amplitude wave solutions in the long-wavelength limit. Accordingly we derive two generic coupled equations which describe the energy exchange between the electrostatic and electromagnetic waves. A new kind of quasi-periodic behavior is found. Our derivations may be considered as a prerequisite to extended studies of stimulated Raman scattering for cases where the wave amplitudes are so large that standard perturbation techniques are not applicable.

  • 3.
    Cabello, Adan
    et al.
    University Seville.
    Larsson, Jan-Åke
    Linköping University, Department of Mathematics, Applied Mathematics. Linköping University, The Institute of Technology.
    Quantum contextuality for rational vectors2010In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 375, no 2, p. 99-99Article in journal (Refereed)
    Abstract [en]

    The Kochen-Specker theorem states that noncontextual hidden variable models are inconsistent with the quantum predictions for every yes-no question on a qutrit, corresponding to every projector in three dimensions. It has been suggested [D.A. Meyer, Phys. Rev. Lett. 83 (1999) 3751] that the inconsistency would disappear when restricting to projectors on unit vectors with rational components; that noncontextual hidden variables could reproduce the quantum predictions for rational vectors. Here we show that a qutrit state with rational components violates an inequality valid for noncontextual hidden-variable models [A.A. Klyachko et al., Phys. Rev. Lett. 101 (2008) 020403] using rational projectors. This shows that the inconsistency remains even when using only rational vectors.

  • 4.
    Gradov, O. M.
    et al.
    Russian Acad Sci, Russia.
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, Faculty of Science & Engineering.
    Basic properties of nonlinear surface charge waves at a plasma boundary2018In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 42-43, p. 3083-3085Article in journal (Refereed)
    Abstract [en]

    The nonlinear properties of surface charges are here analyzed under ideal conditions. We thus deduce a new single equation from the wellknown equations which govern the cold electron plasma motion. Simple formulas that describe the propagation of surface charge perturbations along the plasma boundary are also found. (C) 2018 Elsevier B.V. All rights reserved.

  • 5.
    Kaladze, T. D.
    et al.
    I. Vekua institute of Applied Mathematics Tbilisi State University.
    Pochotelov, O.A.
    Institute of Physics of the Earth.
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
    Rogava, J.
    I. Vekua institute of Applied Mathematics Tbilisi State University.
    Tsamalashvili, L.V.
    I. Vekua institute of Applied Mathematics Tbilisi State University.
    Tsiklauri, M.
    I. Vekua institute of Applied Mathematics Tbilisi State University.
    Zonal flow interaction with Rossby waves in the Earth's atmosphere: A numerical simulation2008In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 372, no 31, p. 5177-5180Article in journal (Refereed)
    Abstract [en]

    A numerical simulation of the Charney-Obukhov equation modified by the presence of a sheared zonal flow is carried out. The zonal flow is assumed to propagate longitudinally and is sheared along the meridians. It is shown that owing to the nonlinear interaction of the sheared zonal flow with the initially given disturbances the energy of the zonal flow is accumulating into the formations which are broken into several pieces. As a result new solitary vortex structures arise to produce the structural turbulence

  • 6.
    Karimov, A.R.
    et al.
    Russian Academy of Science.
    Yu, M.Y.
    Zhejiang University.
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
    Flow oscillations in radial expansion of an inhomogeneous plasma layer2011In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 375, no 27, p. 2629-2636Article in journal (Refereed)
    Abstract [en]

    The cylindrically cylindrically symmetric radial evolution of an inhomogeneous plasma layer expanding into vacuum is investigated nonperturbatively by first determining the spatial structure of the plasma flow structure. The evolution is then governed by a set of ordinary differential equations. The effect of the plasma inhomogeneity on the nonlinear coupling among the electron and ion flow components and oscillations is investigated.

  • 7.
    Larsson, Jan-Åke
    Linköping University, Department of Mathematics. Linköping University, The Institute of Technology.
    Modeling the singlet state with local variables1999In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 256, no 4, p. 245-252Article in journal (Refereed)
    Abstract [en]

    A local-variable model yielding the statistics from the singlet state is presented for the case of inefficient detectors and/or lowered visibility. It has independent errors and the highest efficiency at perfect visibility is 77.80%, while the highest visibility at perfect detector-efficiency is 63.66%. The model cannot be refuted by measurements made to date.

  • 8.
    Lozovik, Yu. E.
    et al.
    Russian Academy of Sciences.
    Kurbakov, I. L.
    Russian Academy of Sciences.
    Willander, Magnus
    Göteborg University.
    Superfluidity of two-dimensional excitons in flat and harmonic trapsI. L.2007In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 366, no 4-5, p. 487-492Article in journal (Refereed)
    Abstract [en]

    Superfluid exciton density and superfluid transition (crossover) temperature are calculated for 2D excitons in large-size flat and harmonic traps. A generalized local density approximation for the Kosterlitz–Thouless theory is developed

  • 9.
    Mozafari, Elham
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Computational Physics. Linköping University, The Institute of Technology.
    Stafström, Sven
    Linköping University, Department of Physics, Chemistry and Biology, Computational Physics. Linköping University, The Institute of Technology.
    Polaron stability in molecular crystals2012In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 376, no 22, p. 1807-1811Article in journal (Refereed)
    Abstract [en]

    A semi-empirical Peierls-Holstein model is applied to studies of the stability of polarons in two-dimensional molecular crystal systems. Calculations for a broad range of intra- and inter-molecular parameters within this model were performed in order to obtain detailed knowledge concerning the stability of the polaron solution with respect to a rigid lattice band solution. For realistic values of the parameters the polaron solution is stable with a polaron energy in the range 50-100 meV. A metastable polaron solution is also identified. The polarons that result from our model are highly localized and it is questionable if adiabatic polaron transport can occur in the system.

  • 10.
    Nouri, N.
    et al.
    Wroclaw Univ Sci and Technol, Poland; Univ Isfahan, Iran.
    Bieniek, M.
    Wroclaw Univ Sci and Technol, Poland.
    Brzezinska, M.
    Wroclaw Univ Sci and Technol, Poland.
    Modarresi, Mohsen
    Linköping University, Department of Science and Technology, Physics and Electronics. Linköping University, Faculty of Science & Engineering. Ferdowsi Univ Mashhad, Iran.
    Borujeni, S. Zia
    Islamic Azad Univ, Iran.
    Rashedi, Gh
    Univ Isfahan, Iran.
    Wojs, A.
    Wroclaw Univ Sci and Technol, Poland.
    Potasz, R.
    Wroclaw Univ Sci and Technol, Poland.
    Topological phases in Bi/Sb planar and buckled honeycomb monolayers2018In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 382, no 40, p. 2952-2958Article in journal (Refereed)
    Abstract [en]

    We investigate topological phases in two-dimensional Bi/Sb honeycomb crystals considering planar and buckled structures, both freestanding and deposited on a substrate. We use the multi-orbital tight-binding model and compare results with density functional theory calculations. We distinguish topological phases by calculating topological invariants, analyzing edge states properties of systems in a ribbon geometry and studying their entanglement spectra. We show that coupling to the substrate induces transition to the Z(2) topological insulator phase. It is observed that topological crystalline insulator (TCI) phase, found in planar crystals, exhibits an additional pair of edge states in both energy spectrum and entanglement spectrum. Transport calculations for TCI phase suggest robust quantized conductance even in the presence of crystal symmetry-breaking disorder. (C) 2018 Elsevier B.V. All rights reserved.

  • 11.
    Shukla, P.K.
    et al.
    Ruhr University Bochum.
    Eliasson, B.
    Ruhr University Bochum.
    Stenflo, Lennart
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics . Linköping University, The Institute of Technology.
    Alfvenic shock waves in a collisional magnetoplasma2011In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 375, no 24, p. 2371-2373Article in journal (Refereed)
    Abstract [en]

    Compressional Alfvenic shock waves in a cold collisional magnetoplasma are investigated. For this purpose, we use the hydrodynamic equations and Faradays law to derive the governing nonlinear equations for the compressional Alfven waves. It is shown that the latter can appear in the form of Alfvenic shock waves.

  • 12.
    Stenflo, Lennart
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics. Linköping University, The Institute of Technology.
    Brodin, G.
    Umeå University, Sweden .
    Collisional contribution to stimulated scattering in plasmas2014In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 378, no 5-6, p. 549-550Article in journal (Refereed)
    Abstract [en]

    The influence of collisions on stimulated Brillouin scattering in magnetized plasmas is discussed. It is shown that new effects occur when the magnitude of the electron quiver velocity exceeds the electron thermal velocity.

  • 13.
    Zhao, QX
    et al.
    Chalmers University of Technology and Göteborg University.
    Jacob, AP
    Chalmers University of Technology and Göteborg University.
    Willander, Magnus
    Chalmers University of Technology and Göteborg University.
    Wang, SM
    Chalmers University of Technology.
    Wei, YQ
    Chalmers University of Technology.
    Ferdos, F
    Chalmers University of Technology.
    Sadeghi, M
    Chalmers University of Technology.
    Larsson, A
    Chalmers University of Technology.
    Yang, JH
    Jilin Normal University.
    Nonradiative centers in InAs dots grown on GaAs substrates for 1.3 mu m emission2003In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 315, no 02-Jan, p. 150-155Article in journal (Refereed)
    Abstract [en]

    Nonradiative centers in InAs dots grown on GaAs substrates are investigated in this study. The emission from InAs dots close to 1.3 mum is monitored under different excitation densities and different excitation energy. The used samples were also treated by hydrogen plasma in order to suppress the nonradiative centers. The purpose of this work is to study how nonradiative centers influence the efficiency of InAs dots emission and whether the nonradiative centers can be reduced. Our results clearly illustrate that there indeed exist nonradiative centers, both at the interface between the InAs dots and surrounding layers and in the GaAs layers, which can be suppressed by H-treatments. A technique to estimate relative amount of nonradiative centers is also discussed.

  • 14.
    Zhao, QX
    et al.
    Chalmers University of Technology.
    Wang, SM
    Chalmers University of Technology.
    Wei, YQ
    Chalmers University of Technology.
    Sadeghi, M
    Chalmers University of Technology.
    Larsson, A
    Chalmers University of Technology.
    Willander, Magnus
    Chalmers University of Technology.
    Radiative recombination of localized excitons and mobility edge excitons in GaInNAs/GaAs quantum wells with strong carrier localization2005In: Physics Letters A, ISSN 0375-9601, E-ISSN 1873-2429, Vol. 341, no 04-Jan, p. 297-302Article in journal (Refereed)
    Abstract [en]

    The radiative recombination in InxGa1-xN0.01As0.99/GaAs quantum well structures exhibiting strong carrier localization was investigated by optical spectroscopy. For In-concentration from 0 to 30%, the results indicate that the degree of carrier localization decreases with increasing In-concentration. At temperatures below 100 K, the mobility edge excitons as well as localized excitons are identified and their transitions energies strongly depend on the excitation intensity. At elevated temperatures the localized excitons become quenched. The temperature dependence of the photoluminescence emission energy shows different behaviors at different excitation intensities.

1 - 14 of 14
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