Effective non-Hermitian physics for degenerate ground states of a non-Hermitian Ising model with RT symmetry

被引：11

作者：

Wang, Can ^{[1
]}

Yang, Meng-Lei ^{[1
]}

Guo, Cui-Xian ^{[1
]}

Zhao, Xiao-Ming ^{[2
]}

Kou, Su-Peng ^{[1
]}

机构：

[1] Beijing Normal Univ, Dept Phys, Ctr Adv Quantum Studies, Beijing 100875, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

EPL | 2019年 / 128卷 / 04期

关键词：

PARITY-TIME SYMMETRY;

D O I：

10.1209/0295-5075/128/41001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

In this paper, based on a one-dimensional non-Hermitian spin model with RT invariant term, we study the non-Hermitian physics for the two (nearly) degenerate ground states. By using the high-order perturbation method, an effective pseudo-spin model is obtained to describe non-Hermitian physics for the two (nearly) degenerate ground states, which are precisely consistent with the numerical calculations. We found that there may exist effective (anti) PT symmetry for the effective pseudo-spin model of the two (nearly) degenerate ground states. In particular, there exists spontaneous (anti) PT-symmetry breaking for the topological degenerate ground states with tunable parameters in external fields. We also found that even a very tiny imaginary external field applied will drive PT phase transition. Copyright (C) EPLA, 2020.

引用

页数：6

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