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Wang, XH; Liu, TT; Xiong, Y; Tong, PQ; Tong, PQ (reprint author), Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China.
Spontaneous PT-symmetry breaking in non-Hermitian Kitaev and extended Kitaev models
Source PublicationPHYSICAL REVIEW A
Language英语
AbstractThe spontaneous parity-time (PT) symmetry breaking is discussed in non-Hermitian PT-symmetric Kitaev and extended Kitaev models whose Hermiticity is broken by the presence of two conjugated imaginary potentials +/- i gamma at two end sites. In the case of the non-Hermitian Kitaev model, a spontaneous PT-symmetry breaking transition (SPT BT) occurs at a certain gamma(c) in the topologically trivial phase (TTP) region, similar to that of the Su-Schrieffer-Heeger (SSH) model. However, unlike the SSH model, the system also undergoes such a transition in the topologically nontrivial phase (TNP) region. We study an extended Kitaev model by combining the superconducting pairing in the Kitaev model and the staggered hopping in the SSH model. This model contains three different topological phases: the TTP, the Kitaev-like TNP, and the SSH-like TNP. For the non-Hermitian extended Kitaev model, a SPT BT occurs in the Kitaev-like TNP region, as well as in part of the TTP and SSH-like TNP regions, whereas the PT symmetry is broken for an arbitrary nonzero gamma in the rest of the TTP and SSH-like TNP regions. Therefore, we can conclude that there is no universal correlation between topological properties and the SPT BT.
2015
Volume92Issue:1Pages:12116
Subject AreaOptics ; Physics
DOIhttp://dx.doi.org/10.1103/PhysRevA.92.012116
Indexed BySCI
Funding OrganizationNational Natural Science Foundation of China [11175087] ; National Natural Science Foundation of China [11175087] ; National Natural Science Foundation of China [11175087] ; National Natural Science Foundation of China [11175087]
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Document Type期刊论文
Identifierhttp://ir.itp.ac.cn/handle/311006/20921
Collection理论物理所科研产出_SCI论文
Corresponding AuthorTong, PQ (reprint author), Nanjing Normal Univ, Dept Phys, Nanjing 210023, Jiangsu, Peoples R China.
Recommended Citation
GB/T 7714
Wang, XH,Liu, TT,Xiong, Y,et al. Spontaneous PT-symmetry breaking in non-Hermitian Kitaev and extended Kitaev models[J]. PHYSICAL REVIEW A,2015,92(1):12116.
APA Wang, XH,Liu, TT,Xiong, Y,Tong, PQ,&Tong, PQ .(2015).Spontaneous PT-symmetry breaking in non-Hermitian Kitaev and extended Kitaev models.PHYSICAL REVIEW A,92(1),12116.
MLA Wang, XH,et al."Spontaneous PT-symmetry breaking in non-Hermitian Kitaev and extended Kitaev models".PHYSICAL REVIEW A 92.1(2015):12116.
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