Dynamical excitonic effects in metals and semiconductors

Details Dynamical excitonic effects in metals and semiconductors Dynamical excitonic effects in metals and semiconductors

2003-08-14

arxiv.org/abs/cond-mat/0308271v1

Physics

Condensed Matter

Materials Science

Accepted for publication on Phys. Rev. Lett

Scientific paper

10.1103/PhysRevLett.91.176402

The dynamics of an electron--hole pair induced by the time--dependent screened Coulomb interaction is discussed. In contrast to the case where the static electron--hole interaction is considered we demonstrate the occurrence of important dynamical excitonic effects in the solution of the Bethe--Salpeter equation.This is illustrated in the calculated absorption spectra of noble metals (copper and silver) and silicon. Dynamical corrections strongly affect the spectra, partially canceling dynamical self--energy effects and leading to good agreement with experiment.

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