Bare LO-phonon peak in THz-emission signals: a dielectric-function analysis

We present a normal-mode analysis of coupled photocarrier-phonon dynamics in Te. We consider a dielectric function which accounts for LO phonons and the electron-hole gas within the Debye- Hüuckel model and RPA. Our main finding is the existence of a bare LO phonon mode in the system even at high ca...

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Bibliographic Details
Published in:Brazilian journal of physics 2002-06, Vol.32 (2a), p.415-417
Main Authors: Souza, Fabrício M., Egues, J. C.
Format: Article
Language:eng ; por
Subjects:
PHYSICS, MULTIDISCIPLINARY
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Summary:We present a normal-mode analysis of coupled photocarrier-phonon dynamics in Te. We consider a dielectric function which accounts for LO phonons and the electron-hole gas within the Debye- Hüuckel model and RPA. Our main finding is the existence of a bare LO phonon mode in the system even at high carrier density. This oscillation is an unscreened L - (q) mode arising from ineffective screening at large wave vectors. This mode is consistent with the bare LO-phonon peak in recent THz-emission spectra of Te.
ISSN:0103-9733
1678-4448
DOI:10.1590/S0103-97332002000200048