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Excitonic effects in solids described by time-dependent density-functional theory

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  • Excitonic effects in solids described by time-dependent density-functional theory
Author
Lucia Reining
Olevano V
Angel Rubio
G Onida
Keywords
paper
Abstract

Starting from the many-body Bethe-Salpeter equation we derive an exchange-correlation kernel f(xc) that reproduces excitonic effects in bulk materials within time-dependent density functional theory. The resulting f(xc) accounts for both self-energy corrections and the electron-hole interaction. It is static, non-local. and has a long-range Coulomb tail. Taking the example of bulk silicon, we show that the -alpha/q(2) divergency is crucial and can, in the case of continuum excitons, even be sufficient for reproducing the excitonic effects and yielding excellent agreement between the calculated and the experimental absorption spectrum.

Year of Publication
2002
Journal
Phys. Rev. Lett.
Volume
88
Date Published
FEB 11
URL
http://dx.doi.org/10.1103/PhysRevLett.88.066404
DOI
10.1103/PhysRevLett.88.066404
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