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- W2163770157 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 $ensuremath{pi}$-conjugated molecules, where this electron-phonon coupling mechanism plays an important role." @default.
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- W2163770157 date "2004-04-12" @default.
- W2163770157 modified "2023-10-14" @default.
- W2163770157 title "Nonlocal electron-phonon coupling: Consequences for the nature of polaron states" @default.
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- W2163770157 doi "https://doi.org/10.1103/physrevb.69.144302" @default.
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