Nonperturbative theory of exciton-phonon resonances in semiconductor absorption

K. Hannewald, P.A. Bobbert

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We develop a theory of exciton-phonon sidebands in the absorption spectra of semiconductors. The theorydoes not rely on an ad hoc exciton-phonon picture, but is based on a more fundamental electron-phononHamiltonian, thus avoiding a priori assumptions about excited-state properties. We derive a nonperturbativecompact solution that can be looked upon as the semiconductor version of the textbook absorption formula fora two-level system coupled to phonons. Accompanied by an illustrative numerical example, the importance andusefulness of our approach with respect to practical applications for semiconductors is demonstrated.
Original languageEnglish
Article number113202
Pages (from-to)113202-1/4
Number of pages4
JournalPhysical Review B
Issue number11
Publication statusPublished - 2005


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