Screening effects in the electron-optical phonon interaction

Preprint

2 July 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9907048

Abstract

We show that recently reported unusual hardening of optical phonons renormalized by the electron-phonon interaction is due to the neglect of screening effects. When the electron-ion interaction is properly screened optical phonons soften in three dimension. It is important that for short-wavelength optical phonons screening is static while for long-wavelength optical phonons screening is dynamic. In two-dimensional and one-dimensional cases due to crossing of the nonperturbed optical mode with gapless plasmons the spectrum of renormalized optical phonon-plasmon mode shows split momentum dependence.

Keywords

WAVELENGTH OPTICAL
PHONON INTERACTION
SCREENING EFFECTS
PHONONS SCREENING
OPTICAL PHONONS
RENORMALIZED
HARDENING

All Related Versions

Version 1, 1999-07-02, ArXiv
Published version: Physical Review B, 61 (1), 40.

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