Nonlocal electron-phonon coupling: consequences for the nature of polaron states

V.M. Stojanovic, P.A. Bobbert, M.A.J. Michels

Research output: Contribution to journalArticleAcademicpeer-review

24 Citations (Scopus)
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Abstract

We develop a variational approach to an extended Holstein model, comprising both local and nonlocal electron-phonon coupling. The approach is based on the minimization of a Bogoliubov bound to the Helmholtz free energy. The ambivalent character of nonlocal coupling, which both promotes and hinders transport, is clearly observed. Furthermore, a salient feature of our results is that the local and nonlocal couplings can compensate each other, leading to a reduction of polaronic effects and a quasi-free character of the excitation. Our findings have implications for organic crystals of p-conjugated molecules, where this electron-phonon coupling mechanism plays an important role.
Original languageEnglish
Article number144302
Pages (from-to)144302-1/13
JournalPhysical Review B
Volume69
Issue number14
DOIs
Publication statusPublished - 2004

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