新科学想法 › 文献管理 › 浏览文献

Effects of Non-Hermiticity on Su-Schrieffer-Heeger Defect States

handsomeland 添加于 2018-9-26 16:52 | 970 次阅读 | 0 个评论

作者
Lang L-J, Wang Y, Wang H, Chong YD
摘要
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 non-topologically-protected defect states of the SSH model. We discuss the phase diagram for the defect states, and its implications for non-Hermitian defect states.
详细资料
- 关键词: cond-mat.mes-hall; physics.optics
- 文献种类:手稿
- 期卷页: 2018年
- 日期: 2018-7-20
- 发布方式: arXiv e-prints
- 备注:http://arxiv.org/abs/1807.07776v1
相关链接 URL
handsomeland 的文献笔记订阅