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  • 1.
    Blomquist, T
    et al.
    Linkoping Univ, Dept Phys, IFM, S-58183 Linkoping, Sweden Linkoping Univ, Dept Sci & Technol, ITN, S-60174 Norrkoping, Sweden.
    Zozoulenko, Igor
    Linköping University, The Institute of Technology. Linköping University, Department of Science and Technology.
    Conductance of a ballistic electron billiard in a magnetic field: does the semiclassical approach apply?2001In: Physica scripta. T, ISSN 0281-1847, Vol. T90, p. 37-40Article in journal (Refereed)
    Abstract [en]

    We utilize a semi-classical approach to calculate conductance and weak localization corrections in a triangular billiard in non-zero magnetic field. Results of the calculations and comparison to numerical quantum mechanical simulations suggest that applicability of the standard semiclassical method for description of the geometry-specific features in the conductance of such systems is not obvious as the unitarity of the semiclassical scattering matrix is violated as well as the symmetry of the conductance/reflectance with respect to the magnetic field and the direction of the current is not satisfied. The reason for this is given. Our findings raise the question to what extend one can rely on numerous predictions for statistical properties of the conductance oscillations of ballistic cavities including the WL lineshapes and fractal conductance which were essentially based on the standard SC approach.

  • 2.
    Ishio, H
    Linkoping Univ, Dept Phys & Measurement Technol, S-58183 Linkoping, Sweden.
    Statistics of resonances in open billiards2001In: Physica scripta. T, ISSN 0281-1847, Vol. T90, p. 60-63Article in journal (Refereed)
    Abstract [en]

    Statistics of resonance poles are computed for time-reversal ballistic transport through chaotic and integrable mesoscopic billiards coupled to a pair of single-channel leads in the regime of overlapping resonances. In the case of chaotic open billiard, the width distribution function shows good agreement with the random-matrix-theory prediction in all ranges of the width. In the case of integrable open billiard, however, there exists some deviation and the agreement is perceived only for the tail of the width distribution function. This is understood quantitatively in terms of classical decay-time distributions. On the other hand, the statistics of resonance positions for both chaotic and integrable open billiards show deviations from the Gaussian-orthogonal-ensemble and Poisson predictions. The statistical nature known for eigenvalues of the closed counterparts of the systems is retrieved after eliminating all the broad resonances compared to the mean resonance spacing.

  • 3.
    Karlsson, Fredrik
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
    Moskalenko, Evgenii
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology.
    Holtz, Per-Olof
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
    Monemar, Bo
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Materials Science .
    Schoenfeld, W.V.
    Garcia, J.M.
    Petroff, P.M.
    Optical charging of self-assembled InAs/GaAs quantum dots2002In: Physica scripta. T, ISSN 0281-1847, Vol. 101, p. 140-142Article in journal (Refereed)
    Abstract [en]

    It is demonstrated that the photoluminescence spectra of single self-assembled quantum dots are very sensitive to the experimental conditions, such as excitation energy and crystal temperature. A qualitative explanation is given in terms of the effective diffusion of the photogenerated carriers, determined by the experimental conditions, which influence the capture probability and hence also the charge state of the quantum dots. This is proposed as an effective tool to populate single quantum dots with extra electrons, by purely optical means, in order to study phenomena involving charged excitons.

  • 4. Petersson, L-G
    et al.
    Dannetun, Helen
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Karlsson, S-E
    Lundström, Ingemar
    Linköping University, Department of Physics, Chemistry and Biology, Applied Physics . Linköping University, The Institute of Technology.
    Surface reactions on Pd studied with a hydrogen sensitive MOS-structure andphotoelectron spectroscopy1982In: Physica scripta. T, ISSN 0281-1847, Vol. 25, p. 818-Article in journal (Refereed)
    Abstract [en]

    During the last couple of years catalytic reactions on Pd surfaces have been studied at our department by means of a hydrogen sensitive Pd-MOS structure and work function measurements. These studies have been performed at atmospheric pressures with Ar and O2 as carrier gases. We have now extended this type of measurements to the ultra-high vacuum (UHV) region and also combined them with both UV and, in certain cases, X-ray photoelectron spectroscopy (UPS, XPS) studies. With this technique we are able to detect about 0.001 of a monolayer of hydrogen, and changes in rate or equilibrium constants corresponding to changes in an energy coordinate of less than 10 meV. Furthermore, results from a Cd contaminated Pd-MOS structure indicates that the ability of Pd to dissociate H2 is related to a microscopic parameter and not to any general metal-like parameter.

  • 5.
    Petoral, Rodrigo Jr
    et al.
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    Uvdal, Kajsa
    Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Sensor Science and Molecular Physics .
    NEXAFS study of amino acid analogues assembled on gold2005In: Physica scripta. T, ISSN 0281-1847, Vol. T115, p. 851-854Article in journal (Refereed)
    Abstract [en]

    In this work, near-edge x-ray absorption fine structure spectroscopy (NEXAFS) experiment is done to obtain the chemical and structural information about the occurrence and the average orientation of unoccupied molecular orbitals within the organic films. Amino acid, such as Tyrosine and 3,4-dihydroxyphenylalanine (DOPA), is linked to a thiol through a peptide bond and is adsorbed and self-assembled to polycrystalline gold surfaces. Results from the C k-edge and O k-edge spectra serves as fingerprints to each amino acid analogues. The average orientation of the molecules relative to the gold surface is determined from the polarization effects observed as intensity changes of the peaks in the spectra when the x-ray incidence angle is varied. It is assumed that the average tilt angle of the main molecular axis of amino acid linked to short amidethiol is based on the deduced orientation of the peptide bond. © Physica Scripta 2005.

  • 6.
    Syväjärvi, Mikael
    et al.
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Müller, J.
    University of Erlangen-Nürnberg, Erlangen, Germany .
    Sun, Jianwu
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Grivickas, Vytautas
    Vilnius University, Lithuania.
    Ou, Yiyu
    Jokubavicius, Valdas
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Hens, Philip
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Kaisr, M.
    University of Erlangen-Nürnberg, Erlangen, Germany .
    Ariyawong, Kanaparin
    Linköping University, Department of Physics, Chemistry and Biology. Linköping University, The Institute of Technology.
    Gulbinas, K.
    Vilnius University, Lithuania.
    Liljedahl, Rickard
    Linköping University, Department of Physics, Chemistry and Biology, Semiconductor Materials. Linköping University, The Institute of Technology.
    Linnarsson, M. K.
    Royal Institute of Technology, Kista-Stockholm .
    Kamiyama, S.
    Meijo University, Nagoya, Japan .
    Wellmann, P.
    University of Erlangen-Nürnberg, Erlangen, Germany .
    Spiecker, E.
    University of Erlangen-Nürnberg, Erlangen, Germany .
    Ou, H.
    Technical University of Denmark, Lyngby.
    Fluorescent SiC as a new material for white LEDs2012In: Physica scripta. T, ISSN 0281-1847, Vol. T148, p. 014002-Article in journal (Refereed)
    Abstract [en]

    Current III–V-based white light-emitting diodes (LEDs) are available. However, their yellow phosphor converter is not efficient at high currents and includes rare-earth metals, which are becoming scarce. In this paper, we present the growth of a fluorescent silicon carbide material that is obtained by nitrogen and boron doping and that acts as a converter using a semiconductor. The luminescence is obtained at room temperature, and shows a broad luminescence band characteristic of donor-to-acceptor pair recombination. Photoluminescence intensities and carrier lifetimes reflect a sensitivity to nitrogen and boron concentrations. For an LED device, the growth needs to apply low-off-axis substrates. We show by ultra-high-resolution analytical transmission electron microscopy using aberration-corrected electrons that the growth mechanism can be stable and that there is a perfect epitaxial relation from the low-off-axis substrate and the doped layer even when there is step-bunching.

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