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

AUTOR(ES)

Souza, Fabrício M., Egues, J. C.

FONTE

Brazilian Journal of Physics

DATA DE PUBLICAÇÃO

2002-06

RESUMO

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.

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