title: On the Munn-Silbey approach to polaron transport with off-diagonal coupling and temperature-dependent canonical transformations.
abstract: Improved results using a method similar to the Munn-Silbey approach have been obtained on the temperature dependence of transport properties of an extended Holstein model incorporating simultaneous diagonal and off-diagonal exciton-phonon coupling. The Hamiltonian is partially diagonalized by a canonical transformation, and optimal transformation coefficients are determined in a self-consistent manner. Calculated transport properties exhibit substantial corrections on those obtained previously by Munn and Silbey for a wide range of temperatures thanks to a numerically exact evaluation and an added momentum-dependence of the transformation matrix. Results on the diffusion coefficient in the moderate and weak coupling regime show distinct band-like and hopping-like transport features as a function of temperature.
authors.affiliation: School of Materials Science and Engineering, Nanyang Technological University, Singapore 639798.
authors.forename: Dongmeng
authors.initials: D
authors.lastname: Chen
authors.forename: Jun
authors.initials: J
authors.lastname: Ye
authors.forename: Haijun
authors.initials: H
authors.lastname: Zhang
authors.forename: Yang
authors.initials: Y
authors.lastname: Zhao