Perturbation theory for the spin-phonon model

被引：5
|
作者：
Wurger, A
机构：
[1] Institut Laue-Langevin, 38042 Grenoble, Avenue des Martyrs
来源：
JOURNAL OF PHYSICS-CONDENSED MATTER | 1997年 / 9卷 / 26期
关键词：
D O I：
10.1088/0953-8984/9/26/004
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
The reduced time evolution operator for the spin-boson model with a cubic bath spectrum is expanded in terms of the spin-phonon coupling parameter. The contributions of first and second order to the damping rate are calculated explicitly. The second-order term constitutes a novel result and yields a rigorous criterion for the validity of various previous theories.
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页码：5543 / 5560
页数：18
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