Topological invariance and global Berry phase in non-Hermitian systems

被引：200

作者：

Liang, Shi-Dong ^{[1
]}

Huang, Guang-Yao

机构：

[1] Sun Yat Sen Univ, State Key Lab Optoelect Mat & Technol, Guangzhou 510275, Guangdong, Peoples R China

来源：

PHYSICAL REVIEW A | 2013年 / 87卷 / 01期

关键词：

QUANTUM; SPINTRONICS;

D O I：

10.1103/PhysRevA.87.012118

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

By studying the topological invariance and Berry phase in non-Hermitian systems, we reveal the basic properties of the complex Berry phase and generalize the global Berry phases Q to identify the topological invariance for non-Hermitian systems. We find that Q can identify topological invariance in two kinds of non-Hermitian model, the two-level non-Hermitian Hamiltonian and the bipartite dissipative model. For the bipartite dissipative model, an abrupt change of the Berry phase in the parameter space reveals a quantum phase transition and is related to the exceptional points. These results give the basic relationships between the Berry phase and the quantum and topological phase transitions of non-Hermitian systems. DOI: 10.1103/PhysRevA.87.012118

引用

页数：6

共 41 条

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