EQUATION OF MOTION FOR THE GREENS-FUNCTION IN ANHARMONIC SOLIDS

被引：10
|
作者：
DELLAVALLE, RG [1 ]
PROCACCI, P [1 ]
机构：
[1] UNIV FLORENCE,DEPT CHIM,I-50121 FLORENCE,ITALY
来源：
PHYSICAL REVIEW B | 1992年 / 46卷 / 10期
关键词：
D O I：
10.1103/PhysRevB.46.6141
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We discuss the double-time Green's-function approach for the phonon-phonon interaction in anharmonic solids. Using a certain interpretation of the phonon operators, the crystal Hamiltonian may be rewritten in a compact form. The equation of motion for the Green's function is tremendously simplified with this formalism. The self-energy can be obtained in a very simple way, to any desired perturbation order. Our results reproduce the corresponding terms of the available literature results, which are limited to the fourth order in the perturbation parameter.
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页码：6141 / 6149
页数：9
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