Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-03-08
Physical Review Letters 96, 136405 (2006)
Physics
Condensed Matter
Strongly Correlated Electrons
accepted for publication in PRL
Scientific paper
10.1103/PhysRevLett.96.136405
The optical absorption of the Fr\"{o}hlich 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 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.
Cataudella Vittorio
Devreese J. T.
Filippis Giulio de
Mishchenko Alexander S.
Perroni C. A.
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