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

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

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26 Citaten (Scopus)
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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.
Originele taal-2Engels
Pagina's (van-tot)144302-1/13
TijdschriftPhysical Review B
Nummer van het tijdschrift14
StatusGepubliceerd - 2004


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