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  • Composite materials  (1)
  • Electrons states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds)  (1)
  • superradiance and superfluorescence  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 18 (1996), S. 865-872 
    ISSN: 0392-6737
    Keywords: Elemental semiconductors (crystalline) ; Composite materials
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We report absorption measurements on Ge nanoparticles in the range 0.6–6 eV. By reducing the dot average radius to about 13 Å, one observes a relevant blue-shift of theE 1+Δ 1 andE 2 peaks and a change of the oscillator strength of the two main structures. Simulations using effective-medium theories have been carried out and the embedding matrix contribution to the measured properties has been evaluated. The different behaviour of the absorption peaksE 1,E 1+Δ 1 andE 2 under quantum confinement has been related to their specific nature within the whole Brillouin zone.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1211-1218 
    ISSN: 0392-6737
    Keywords: Polaritons (including photon-phonon and photon-magnon interactions) ; Electrons states in low-dimensional structures (including quantum wells, superlattices, layer structures, and intercalation compounds) ; III–V and II–VI inorganics ; Excitons and related phenomena (including electron-hole drops) ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary A description of polariton effects on excitons in multiple quantum wells (MQWs), superlattices (SLs), and semiconductor microvavities is presented. The non-local semi-classical theory in a transfer matrix formulation is adopted. The radiative width in MQWs atk=0 increases first with the number of wellsN, then goes to zero asN→∞, where stationary SL polaritons are recovered. The crossover from weak- to strong-coupling regimes for QW excitons in microcavities is described. The complex energies of the mixed exciton-radiation modes are shown to be measurable by time-resolved transmission experiments.
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    Springer
    Il nuovo cimento della Società Italiana di Fisica 17 (1995), S. 1651-1656 
    ISSN: 0392-6737
    Keywords: Excitons and related phenomena (including electron-hole drops) ; Polaritons (including photon-phonon and photon-magnon interactions) ; III–V semiconductors ; Cooperative phenomena ; superradiance and superfluorescence ; Conference proceedings
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Summary We study excitons in double quantum wells (DQWs) embedded in a semiconductor microcavity (MC) by means of semi-classical theory, which yields analytic results in weak- and strong-coupling regimes. We show how to obtain subpicosecond radiative lifetime for the excitons. A model for disorder is investigated.
    Type of Medium: Electronic Resource
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