Small-Polaron Propagators
- 15 March 1971
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 3 (6) , 1991-1999
- https://doi.org/10.1103/physrevb.3.1991
Abstract
The diagrammatic expansion in the real-time domain of the one-electron and electron-hole propagators for the small-polaron problem is presented. For this purpose, special graphs consisting of fermion lines, multiphonon interaction lines, and migration vertices are used. The spectral function of the small-polaron propagator is calculated for two cases. First, the interaction with a narrow band of optical modes, and second, the interaction with longitudinal acoustic modes, is considered. The expressions for the small-polaron mobility in the hopping region are also derived for both models.Keywords
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