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  • Digitale Medien  (4)
  • Loseblatt
  • 2000-2004  (4)
  • 1990-1994
  • 2003  (4)
  • PACS. 64.70.Pf Glass transitions – 78.35.+c Brillouin and Rayleigh scattering; other light scattering – 61.25.Em Molecular liquids  (2)
  • PACS. 71.35.-y Excitons and related phenomena  (2)
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Materialart
  • Digitale Medien  (4)
  • Loseblatt
Erscheinungszeitraum
  • 2000-2004  (4)
  • 1990-1994
Jahr
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Light scattering by longitudinal acoustic modes in supercooled molecular liquids II: microscopic derivation of the phenomenological equations (2003)
    Springer
    The European physical journal 31 (2003), S. 229-246 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 64.70.Pf Glass transitions – 78.35.+c Brillouin and Rayleigh scattering; other light scattering – 61.25.Em Molecular liquids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: The constitutive equations for the orientational dynamics of a liquid formed of linear molecules are derived microscopically. The resulting generalised Langevin equations coincide with the phenomenological approach of Dreyfus et al. [1]. Formally exact expressions are given for the phenomenological coefficients and various constraints are shown to be consequences of this microscopic approach.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00027-5
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Light scattering by longitudinal acoustic modes in molecular supercooled liquids I: phenomenological approach (2003)
    Springer
    The European physical journal 31 (2003), S. 217-228 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 64.70.Pf Glass transitions – 78.35.+c Brillouin and Rayleigh scattering; other light scattering – 61.25.Em Molecular liquids
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We derive expressions for the intensity of the Brillouin polarized spectrum of a molecular liquid formed of axially symmetric molecules. These expressions take into account both the molecular dielectric anisotropy and the modulation of the local polarisability by density fluctuations. They also incorporate all the retardation effects which occur in such liquids. We show that the spectrum splits into a q-independent rotational contribution and q-dependent term, which reflects the propagation of longitudinal acoustic modes. In the latter, the two light scattering mechanisms enter on an equal footing and generate three scattering channels. We study the influence of the two new channels and show that they may substantially modify the Brillouin line-shape when the relaxation time of the supercooled liquid and the period of the acoustic excitation are of the same order of magnitude.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00026-6
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    Density expansion of the energy of N close-to-boson excitons (2003)
    Springer
    The European physical journal 31 (2003), S. 517-523 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 71.35.-y Excitons and related phenomena
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: Pauli exclusion between the carriers of N excitons induces novel many-body effects, quite different from the ones generated by Coulomb interaction. Using our commutation technique for interacting close-to-boson particles, we here calculate the Hamiltonian expectation value in the N-ground-state-exciton state. Coulomb interaction enters this quantity at first order only by construction; nevertheless, due to Pauli exclusion, subtle many-body effects take place, which give rise to terms in (Na x 3/ )n with n ≥ 2. An exact procedure to get these density dependent terms is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00061-3
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 4
    Digitale Medien
    Digitale Medien
    Trions in first and second quantizations (2003)
    Springer
    The European physical journal 33 (2003), S. 311-320 
    Details
    ISSN: 1434-6036
    Schlagwort(e): PACS. 71.35.-y Excitons and related phenomena
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract: We reconsider the semiconductor trions from scratch. We first determine the very many “reasonable” ways to write the trions in first quantization. We then select the forms which are easy to relate to physical pictures. In a second part, we derive the corresponding creation operators in second quantization. We pay particular attention to the expression of the X- trion in terms of exciton and free-electron, as it is the one adapted to future works on many-body effects with trions.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1140/epjb/e2003-00171-x
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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