Journal Article

PreJuSER-57567

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Validity of the Franck-Condon principle in the optical spectroscopy: optical conductivity of the Fröhlich polaron

de Filippis, G. ; Cataudella, V. ; Mishchenko, A. S. ; Perroni, C. A.FZJ* ; Devreese, J. T.

2006
APS College Park, Md.

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Please use a persistent id in citations: http://hdl.handle.net/2128/7706  doi:10.1103/PhysRevLett.96.136405

Abstract: The optical absorption of the Frohlich polaron model is obtained by an approximation-free diagrammatic Monte Carlo method and compared with two new approximate approaches that treat lattice relaxation effects in different ways. We show that: (i) a strong coupling expansion, based on the Franck-Condon principle, well describes the optical conductivity for large coupling strengths (alpha > 10); (ii) a memory function formalism with phonon broadened levels reproduces the optical response for weak coupling strengths (alpha < 6) taking the dynamic lattice relaxation into account. In the coupling regime 6 <alpha < 10, the optical conductivity is a rapidly changing superposition of both Franck-Condon and dynamic contributions.

Keyword(s): J

Note: Record converted from VDB: 12.11.2012

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Research Program(s):

1. Kondensierte Materie (P54)

Appears in the scientific report 2006
Notes: Nachtrag

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