Real time evolution in quantum many-body systems with unitary perturbation theory

被引：48

作者：

Hackl, A. ^{[1
]}

Kehrein, S. ^{[2
,3
]}

机构：

[1] Univ Cologne, Inst Theoret Phys, D-50937 Cologne, Germany

[2] Univ Munich, Arnold Sommerfeld Ctr Theoret Phys, Dept Phys, D-80333 Munich, Germany

[3] Univ Munich, CeNS, D-80333 Munich, Germany

来源：

PHYSICAL REVIEW B | 2008年 / 78卷 / 09期

关键词：

D O I：

10.1103/PhysRevB.78.092303

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We develop an analytical method for solving real time evolution problems of quantum many-body systems. Our approach is a direct generalization of the well-known canonical perturbation theory for classical systems. Similar to canonical perturbation theory, secular terms are avoided in a systematic expansion and one obtains stable long-time behavior. These general ideas are illustrated by applying them to the spin-boson model and studying its nonequilibrium spin dynamics.

引用

页数：4

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