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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-Huckel 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- 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.

preprint2002arXivOpen access
Fabricio M. SouzaJ. C. Egues
cond-mat.str-el
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Fabricio M. SouzaJ. C. Egues

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