Browsing by Subject "Phonon confinement"

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    Confined optical phonon effects on the band gap renormalization in quantum wire structures
    (Elsevier Science, 1999) Bennett, C. R.; Güven, K.; Tanatar, Bilal
    We consider the different approximations for the bandgap renormalization (BGR) within the random phase approximation (RPA), the quasi-static limit and the plasmon-pole approximation, and compare with the full result. We then include bulk optical phonons and also the phonon confinement using the phonons from the dielectric continuum (DC) model. We show that the results are very similar except at low densities where the quasi-static results overestimate the renormalization.
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    Phonon confinement and screening effects on the polaron energy in quantum wires
    (Institute of Physics Publishing Ltd., 1995) Tanatar, Bilal; Guven, K.
    We study the contribution of confined phonons to the polaron energy in quantum-well wires. We use a dispersionless, macroscopic continuum model to describe the phonon confinement in quantum wires of square cross section. The polaron energy is calculated variationally incorporating the dynamic screening effects. We find that the confined phonon contribution to the polaron energy is comparable to that of bulk phonons in the density range N = 104-107 cm-1. Screening effects within the random-phase approximation significantly reduce the electron-confined phonon interaction, whereas the correlation effects tend to oppose this trend.