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Title: Effects of non-Hermiticity on Su-Schrieffer-Heeger defect states
Authors: Lang, Li-Jun
Wang, You
Wang, Hailong
Chong, Yi Dong
Keywords: Topological Defects
Topological Effects in Photonic Systems
Issue Date: 2018
Source: Lang, L.-J., Wang, Y., Wang, H., & Chong, Y. D. (2018). Effects of non-Hermiticity on Su-Schrieffer-Heeger defect states. Physical Review B, 98(9), 094307-. doi:10.1103/PhysRevB.98.094307
Series/Report no.: Physical Review B
Abstract: We study the emergence and disappearance of defect states in the complex Su-Schrieffer-Heeger (cSSH) model, a non-Hermitian one-dimensional lattice model containing gain and loss on alternating sites. Previous studies of this model have focused on the existence of a non-Hermitian defect state that is localized to the interface between two cSSH domains, and is continuable to the topologically protected defect state of the Hermitian Su-Schrieffer-Heeger (SSH) model. For large gain/loss magnitudes, we find that these defect states can disappear into the continuum, or undergo pairwise spontaneous breaking of a composite sublattice/time-reversal symmetry. The symmetry-breaking transition gives rise to a pair of defect states continuable to nontopologically protected defect states of the SSH model. We discuss the phase diagram for the defect states, and its implications for non-Hermitian defect states.
ISSN: 2469-9950
DOI: 10.1103/PhysRevB.98.094307
Rights: © 2018 American Physical Society (APS). This paper was published in Physical Review B and is made available as an electronic reprint (preprint) with permission of American Physical Society (APS). The published version is available at: []. One print or electronic copy may be made for personal use only. Systematic or multiple reproduction, distribution to multiple locations via electronic or other means, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper is prohibited and is subject to penalties under law.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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