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  • 51.
    Jääskeläinen, Markku
    et al.
    Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721, USA.
    Zhang, Weiping
    Department of Physics, Tsinghua University, Beijing 100084, China.
    Meystre, Pierre
    Optical Sciences Center, The University of Arizona, Tucson, Arizona 85721, USA.
    Limits to phase resolution in matter-wave interferometry2004In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 70, no 6, article id 063612Article in journal (Refereed)
    Abstract [en]

    We study the quantum dynamics of a two-mode Bose-Einstein condensate in a time-dependent symmetric double-well potential using analytical and numerical methods. The effects of internal degrees of freedom on the visibility of interference fringes during a stage of ballistic expansion are investigated varying particle number, nonlinear interaction sign and strength, as well as tunneling coupling. Expressions for the phase resolution are derived and the possible enhancement due to squeezing is discussed. In particular, the role of the superfluid-Mott insulator crossover and its analog for attractive interactions is recognized.

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  • 52.
    Jääskeläinen, Markku
    et al.
    Institute of Fundamental Sciences and MacDiarmid Institute for Advanced Materials and Nanotechnology, Massey University, Manawatu Campus, Private Bag 11 222, Palmerston North 4442, New Zealand.
    Zulicke, Ulrich
    Massey University.
    Anomalous spin-related quantum phase in mesoscopic hole rings2010In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 81, no 15, article id 155326Article in journal (Refereed)
    Abstract [en]

    We have obtained numerically exact results for the spin-related geometric quantum phases that arise in p-type semiconductor ring structures. The interplay between gate-controllable (Rashba) spin splitting and quantum-confinement-induced mixing between hole-spin states causes a much higher sensitivity of magnetoconductance oscillations to external parameters than previously expected. Our results imply a much-enhanced functionality of hole-ring spin-interference devices and shed new light on recent experimental findings.

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  • 53.
    Linnaeus, Staffan
    Dalarna University, School of Technology and Business Studies, Physics.
    Phase-integral solution of the radial Dirac equation2010In: Journal of Mathematical Physics, ISSN 0022-2488, E-ISSN 1089-7658, Vol. 51, no 3, article id 032304Article in journal (Refereed)
    Abstract [en]

    A phase-integral (WKB) solution of the radial Dirac equation is constructed, retaining perfect symmetry between the two components of the wave function and introducing no singularities except at the classical transition points. The potential is allowed to be the time component of a four-vector, a Lorentz scalar, a pseudoscalar, or any combination of these. The key point in the construction is the transformation from two coupled first-order equations constituting the radial Dirac equation to a single second-order Schroumldinger-type equation. This transformation can be carried out in infinitely many ways, giving rise to different second-order equations but with the same spectrum. A unique transformation is found that produces a particularly simple second-order equation and correspondingly simple and well-behaved phase-integral solutions. The resulting phase-integral formulas are applied to unbound and bound states of the Coulomb potential. For bound states, the exact energy levels are reproduced.

  • 54.
    Linnaeus, Staffan
    Dalarna University, School of Technology and Business Studies, Physics.
    Stokes constants for a singular wave equation2005In: Journal of Mathematical Physics, ISSN 0022-2488, E-ISSN 1089-7658, Vol. 45, no 5, article id 053505Article in journal (Refereed)
    Abstract [en]

    The Stokes constants for arbitrary-order phase-integral approximations are calculated when the square of the wave number has either two simple zeros close to a second-order pole or one simple zero close to a first-order pole. The treatment is based on uniform approximations. All parameters may assume general complex values.

  • 55. Miller, Tim
    et al.
    Johansson, Sverker
    Dalarna University, Not School affiliated. Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Initial Analysis of Coincident Events Between the SPASE and AMANDA Detectors1995In: Nuclear Physics, no 43, p. 245-248Article in journal (Refereed)
  • 56. Mock, P
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Status and Capabilities of AMANDA-941995In: The XXIV International Cosmic Ray Conference, Rome 1995, 1995Conference paper (Other academic)
  • 57. Price, Buford
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    1995-96 results for the AMANDA neutrino observatory1996In: The Seventh International Workshop on Neutrino Telescopes, Venice, Italy, 27 February - 1 March 1996, 1996, p. p383-Conference paper (Other academic)
  • 58. Thylwe, Karl-Erik
    et al.
    Linnaeus, Staffan
    Dalarna University, School of Technology and Business Studies, Physics.
    Semiclassical aspects and supersymmetry of bound Dirac states for central pseudo-scalar potentials2011In: Physica Scripta, ISSN 0031-8949, E-ISSN 1402-4896, Vol. 84, no 2, article id 025006Article in journal (Refereed)
    Abstract [en]

    Relativistic bound states for a linear, radial pseudo-scalar potential model are discussed. The two radial Dirac components are known to have a close connection to partner states in super-symmetric quantum mechanical theory. The pseudo-scalar potential plays the role of the 'super potential'. Hence, the Dirac components satisfy decoupled Schrodinger-type equations with isospectral, so-called, 'partner potentials' except possibly for a single state; the ground state corresponding to one of the partner potentials. The energy spectrum of a confining linear radial potential is discussed in some detail. Accurate amplitude-phase computations and a novel semiclassical (phase-integral) approach are presented.

  • 59. Tilav, S
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Indirect Evidence for Long Absorption Lengths in Antarctic Ice1995In: The XXIV International Cosmic Ray Conference, Rome 1995, 1995Conference paper (Other academic)
  • 60.
    Valyukh, Iryna
    Dalarna University, School of Technology and Business Studies, Materials Technology. Uppsala universitet, Institutionen för teknikvetenskaper.
    Optical Characterization and Optimization of Display Components: Some Applications to Liquid-Crystal-Based and Electrochromics-Based Devices2009Doctoral thesis, comprehensive summary (Other academic)
    Abstract [en]

    This dissertation is focused on theoretical and experimental studies of optical properties of materials and multilayer structures composing liquid crystal displays (LCDs) and electrochromic (EC) devices.

    By applying spectroscopic ellipsometry, we have determined the optical constants of thin films of electrochromic tungsten oxide (WOx) and nickel oxide (NiOy), the films’ thickness and roughness. These films, which were obtained at spattering conditions possess high transmittance that is important for achieving good visibility and high contrast in an EC device.

    Another application of the general spectroscopic ellipsometry relates to the study of a photo-alignment layer of a mixture of azo-dyes SD-1 and SDA-2. We have found the optical constants of this mixture before and after illuminating it by polarized UV light. The results obtained confirm the diffusion model to explain the formation of the photo-induced order in azo-dye films.

    We have developed new techniques for fast characterization of twisted nematic LC cells in transmissive and reflective modes. Our techniques are based on the characteristics functions that we have introduced for determination of parameters of non-uniform birefringent media. These characteristic functions are found by simple procedures and can be utilised for simultaneous determination of retardation, its wavelength dispersion, and twist angle, as well as for solving associated optimization problems.

    Cholesteric LCD that possesses some unique properties, such as bistability and good selective scattering, however, has a disadvantage – relatively high driving voltage (tens of volts). The way we propose to reduce the driving voltage consists of applying a stack of thin (~1µm) LC layers.

    We have studied the ability of a layer of a surface stabilized ferroelectric liquid crystal coupled with several retardation plates for birefringent color generation. We have demonstrated that in order to accomplish good color characteristics and high brightness of the display, one or two retardation plates are sufficient.

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  • 61.
    Weatherall, James Owen
    et al.
    Stevens Institute of Technology.
    Search, Christopher P.
    Stevens Institute of Technology.
    Jääskeläinen, Markku
    Department of Physics and Engineering Physics, Stevens Institute of Technology, Castle Point on Hudson, Hoboken, New Jersey 07030, USA.
    Quantum control of electromagnetically induced transparency dispersion via atomic tunneling in a double-well Bose-Einstein condensate2008In: Physical Review A. Atomic, Molecular, and Optical Physics, ISSN 1050-2947, E-ISSN 1094-1622, Vol. 78, no 1, article id 013830Article in journal (Refereed)
    Abstract [en]

    Electromagnetically induced transparency (EIT) is an important tool for controlling light propagation and nonlinear wave mixing in atomic gases with potential applications ranging from quantum computing to table top tests of general relativity. Here we consider EIT in an atomic Bose-Einstein condensate (BEC) trapped in a double-well potential. A weak probe laser propagates through one of the wells and interacts with atoms in a three-level Lambda configuration. The well through which the probe propagates is dressed by a strong control laser with Rabi frequency Omega(mu), as in standard EIT systems. Tunneling between the wells at the frequency g provides a coherent coupling between identical electronic states in the two wells, which leads to the formation of interwell dressed states. The macroscopic interwell coherence of the BEC wave function results in the formation of two ultranarrow absorption resonances for the probe field that are inside of the ordinary EIT transparency window. We show that these new resonances can be interpreted in terms of the interwell dressed states and the formation of a type of dark state involving the control laser and the interwell tunneling. To either side of these ultranarrow resonances there is normal dispersion with very large slope controlled by g. We discuss prospects for observing these ultranarrow resonances and the corresponding regions of high dispersion experimentally.

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  • 62. Wischnewski, K
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    A System to Search for Supernova Bursts with the AMANDA Detector1995In: The XXIV International Cosmic Ray Conference, Rome 1995, 1995Conference paper (Other academic)
  • 63.
    Zivkovic, Marko
    et al.
    Stevens Institute of Technology.
    Jääskeläinen, Markku
    Dalarna University, School of Technology and Business Studies, Physics. Department of Physics and Engineering Physics, Stevens Institute of Technology, Hoboken, New Jersey 07030, USA.
    Search, Christopher P.
    Stevens Institute of Technology.
    Djuric, Ivana
    Stevens Institute of Technology.
    Sagnac rotational phase shifts in a mesoscopic electron interferometer with spin-orbit interactions2008In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 77, no 11, article id 115306Article in journal (Refereed)
    Abstract [en]

    The Sagnac effect is an important phase coherent effect in optical and atom interferometers where rotations of the interferometer with respect to an inertial reference frame result in a shift in the interference pattern proportional to the rotation rate. Here, we analyze the Sagnac effect in a mesoscopic semiconductor electron interferometer. We include in our analysis the Rashba spin-orbit interactions in the ring. Our results indicate that spin-orbit interactions increase the rotation-induced phase shift. We discuss the potential experimental observability of the Sagnac phase shift in such mesoscopic systems.

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  • 64. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    A search for multiplicity fluctuations in high energy nucleus-nucleus collisions1990In: Physics Letters, no 252, p. p 303-Article in journal (Other academic)
  • 65. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    A search for weakly interacting neutral particles in missing energy events in 450 GeV/c pN collisions1991In: Zeitschrift für Physik, no 52, p. p 219-Article in journal (Other academic)
  • 66. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    A study of electron-muon pair production in 450 GeV/c pBe collisions1996In: Zeitschrift für Physik, no 72, p. p 429-Article in journal (Other academic)
  • 67. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Dalarna University, Not School affiliated. Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    An emulsion study of 16O and 32S interactions at 200 GeV per nucleon selected by transverse energy1990In: Nuclear Physics, no 342, p. 279-301Article in journal (Other academic)
  • 68. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Charged-particle multiplicity distributions in oxygen-nucleus collisions at 60 and 200 GeV per nucleon1990In: Nuclear Physics, no 333, p. 48-65Article in journal (Other academic)
  • 69. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Diffraction dissociation of nuclei in 450 GeV/c proton-nucleus collisions1991In: Zeitschrift für Physik, no 49, p. p 355-Article in journal (Other academic)
  • 70. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Inclusive negative particle p^ spectra in p-nucleus and nucleus-nucleus collisions at 200 GeV per nucleon1990In: Zeitschrift für Physik, no 46, p. 361-367Article in journal (Other academic)
  • 71. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Inclusive photon production in pA and AA collisions at 200 GeV/u1990In: Zeitschrift für Physik, no 46, p. 369-375Article in journal (Other academic)
  • 72. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Kaon production in 200 GeV/nucleon nucleus-nucleus collisions1992In: Physics Letters, no 296, p. p 273-Article in journal (Other academic)
  • 73. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Low-mass lepton-pair production in p-Be collisions at 450 GeV/c1995In: Zeitschrift für Physik, no 68, p. p 43-Article in journal (Other academic)
  • 74. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Measurement of the transverse energy flow in nucleus-nucleus collisions at 200 GeV per nucleon1991In: Nuclear Physics, no 353, p. p 1-Article in journal (Other academic)
  • 75. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Proton distributions in the target fragmentation region in proton-nucleus and nucleus-nucleus collisions at high energies1992In: Zeitschrift für Physik, no 53, p. p 183-Article in journal (Other academic)
  • 76. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    The transverse energy distribution of 32S -nucleus collisions at 200 GeV per nucleon1988In: Physics Letters, no 214, p. 295-302Article in journal (Other academic)
  • 77. Åkesson, Torsten
    et al.
    Johansson, Sverker
    Högskolan för lärande och kommunikation, Högskolan i Jönköping, HLK, Ämnesforskning.
    Transverse energy measurements in proton-nucleus interactions at high energy1993In: Zeitschrift für Physik C Particles and Fields, ISSN 0170-9739, E-ISSN 1431-5858, Vol. 58, no 2, p. 239-249Article in journal (Other academic)
12 51 - 77 of 77
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