Real-time renormalization-group analysis of the dynamics of the spin-boson model

被引：56

作者：

Keil, M ^{[1
]}

Schoeller, H

机构：

[1] Univ Gottingen, Inst Theoret Phys, D-37073 Gottingen, Germany

[2] Forschungszentrum Karlsruhe, Inst Nanotechnol, D-76021 Karlsruhe, Germany

来源：

PHYSICAL REVIEW B | 2001年 / 63卷 / 18期

关键词：

D O I：

10.1103/PhysRevB.63.180302

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Using a real-time renormalization-group method we determine the complete dynamics of the spin-boson model with Ohmic dissipation for coupling strengths alpha less than or similar to0.1-0.2. We calculate the relaxation and dephasing time, static susceptibility. and correlation functions. Our results are consistent with quantum Monte Carlo simulations and the Shiba relation. We present reliable results for finite cutoff and finite bias in a regime where perturbation theory in alpha or in tunneling breaks down. Furthermore, an unambiguous comparison to results from the Kondo model is achieved.

引用

页数：4

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