Quantum Phase Transition and Universality Class for a Boson-Impurity Model: Implications for the Spin-Boson Model

被引：0

作者：

Fischer, Kurt ^{[1
]}

机构：

[1] Tokuyama Coll Technol, Shunan, Yamaguchi 7458585, Japan

来源：

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2013年 / 82卷 / 07期

关键词：

quantum phase transition; boson systems; renormalization group; path-integral; spin-boson model; Ising model; LONG-RANGE INTERACTIONS; CRITICAL EXPONENTS; SYSTEMS;

D O I：

10.7566/JPSJ.82.073001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We introduce a boson-impurity model, and prove that it is in the same universality class as the one-dimensional Ising model with algebraic decaying interaction. This boson-impurity model can be derived from the spin-boson model. The spin-boson model itself is therefore in the same universality class as well. Because the boson-impurity model contains only virtual spin-fluctuations, these are already enough to drive the quantum phase transition of the sub-ohmic spin-boson model.

引用

页数：4

共 29 条

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