PT symmetry in the non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials

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	PT symmetry in the non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials
	Zhu, BG ; Lu, R ; Chen, S
刊名	PHYSICAL REVIEW A
	2014
卷号	89 期号:6
ISSN号	1050-2947
通讯作者	Zhu, BG (reprint author), Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China.
中文摘要	We study the parity-and time-reversal (PT) symmetric non-Hermitian Su-Schrieffer-Heeger (SSH) model with two conjugated imaginary potentials +/- i gamma at two end sites. The SSH model is known as one of the simplest two-band topological models which has topologically trivial and nontrivial phases. We find that the non-Hermitian terms can lead to different effects on the properties of the eigenvalues spectrum in topologically trivial and nontrivial phases. In the topologically trivial phase, the system undergos an abrupt transition from the unbroken PT-symmetry region to the spontaneously broken PT-symmetry region at a certain gamma c, and a second transition occurs at another transition point gamma(c)' when further increasing the strength of the imaginary potential gamma. But in the topologically nontrivial phase, the zero-mode edge states become unstable for arbitrary nonzero gamma and the PT symmetry of the system is spontaneously broken, which is characterized by the emergence of a pair of conjugated imaginary modes.
资助信息	National Program for Basic Research of MOST; NSF of China [11374354, 11174360, 11121063]; Strategic Priority Research Program of the Chinese Academy of Sciences [XDB07000000]; NSFC [11274195]; National Basic Research Program of China (973 Program) [2011CB606405, 2013CB922000]
语种	英语
公开日期	2015-04-14
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/59474]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Zhu, BG,Lu, R,Chen, S. PT symmetry in the non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials[J]. PHYSICAL REVIEW A,2014,89(6).
APA	Zhu, BG,Lu, R,&Chen, S.(2014).PT symmetry in the non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials.PHYSICAL REVIEW A,89(6).
MLA	Zhu, BG,et al."PT symmetry in the non-Hermitian Su-Schrieffer-Heeger model with complex boundary potentials".PHYSICAL REVIEW A 89.6(2014).