SEMICLASSICAL SMALL-POLARON HOPPING IN A GENERALIZED MOLECULAR-CRYSTAL MODEL

被引:35
作者
EMIN, D
机构
[1] Sandia National Laboratories, Albuquerque
来源
PHYSICAL REVIEW B | 1991年 / 43卷 / 14期
关键词
D O I
10.1103/PhysRevB.43.11720
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
The thermally activated rates for high-temperature adiabatic and nonadiabatic small-(bi)polaron hopping are calculated for a generalization of Holstein's molecular-crystal model. In the expanded model a carrier occupying a molecule is coupled to many molecular vibrational modes rather than to just the single vibrational mode envisioned in the original model. This generalization of the molecular-crystal model does not significantly affect the semiclassical small-(bi)polaron jump rates. In particular, for the generalized model the hopping activation energy becomes a sum of contributions associated with each of the vibrational modes to which the carrier is coupled. The vibrational frequency that is the preexponential factor for adiabatic small-(bi)polaron hopping is the square root of the sum of the squares of the vibrational frequencies weighted by their relative contributions to the net hopping activation energy.
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页码:11720 / 11724
页数:5
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