Quantum-phase transition in a XY model

被引：37
|
作者：
Pires, A. S. T. [1 ]
机构：
[1] Univ Fed Minas Gerais, Dept Fis, BR-30123970 Belo Horizonte, MG, Brazil
来源：
PHYSICA A-STATISTICAL MECHANICS AND ITS APPLICATIONS | 2007年 / 373卷
关键词：
quantum-phase transition; XY model; one-dimensional;
D O I：
10.1016/j.physa.2006.08.004
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
In this paper we study quantum-phase transition in the one-dimensional XY model with an XY easy-plane single ion anisotropy. We use the path-integral formalism, but consider the effect of quantum fluctuations, which renormalize the parameters of the system, using the self-consistent harmonic approximation. We show that the quantum fluctuations increase the effective coupling constant of the model. (c) 2006 Elsevier B.V. All rights reserved.
引用
收藏
页码：387 / 391
页数：5
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