多层非互惠苏-施里弗-黑格尔结构中依赖奇偶性的集肤效应和拓扑特性

IF 6.5 2区 物理与天体物理 Q1 PHYSICS, MULTIDISCIPLINARY
Jia-Rui Li, Cui Jiang, Han Su, Di Qi, Lian-Lian Zhang, Wei-Jiang Gong
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引用次数: 0

摘要

通过考虑单元格中不同子晶格之间的非互易耦合,我们集中研究了多层非ermitian Su-Schrieffer-Heeger (SSH) 结构中的集肤效应和拓扑特性。通过对理论方法的详细论证,我们发现在该系统中,随着 SSH 结构层数的增加,由非互易耦合诱发的集肤效应和拓扑相变显示出明显的奇偶效应。一方面,趋肤效应是由该 SSH 系统层数的奇偶性以及体态带指数的奇偶性决定的。另一方面,对于拓扑边缘模式,也可以清楚地观察到这种有趣的奇偶效应。其次,当考虑到参数紊乱时,奇数层结构中的零能边缘模趋于更稳健,而其他边缘模则容易被破坏。鉴于这些结果,可以确定本研究的发现有助于理解非互易耦合对多层 SSH 晶格的集肤效应和拓扑性质的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su–Schrieffer–Heeger structures

Parity-dependent skin effects and topological properties in the multilayer nonreciprocal Su–Schrieffer–Heeger structures

We concentrate on the skin effects and topological properties in the multilayer non-Hermitian Su–Schrieffer–Heeger (SSH) structure, by taking into account the nonreciprocal couplings between the different sublattices in the unit cells. Following the detailed demonstration of the theoretical method, we find that in this system, the skin effects and topological phase transitions induced by nonreciprocal couplings display the apparent parity effect, following the increase of the layer number of this SSH structure. On the one hand, the skin effect is determined by the parity of the layer number of this SSH system, as well as the parity of the band index of the bulk states. On the other hand, for the topological edge modes, such an interesting parity effect can also be observed clearly. Next, when the parameter disorders are taken into account, the zero-energy edge modes in the odd-layer structures tend to be more robust, whereas the other edge modes are easy to be destroyed. In view of these results, it can be ascertained that the findings in this work promote to understand the influences of nonreciprocal couplings on the skin effects and topological properties in the multilayer SSH lattices.

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来源期刊
Frontiers of Physics
Frontiers of Physics PHYSICS, MULTIDISCIPLINARY-
CiteScore
9.20
自引率
9.30%
发文量
898
审稿时长
6-12 weeks
期刊介绍: Frontiers of Physics is an international peer-reviewed journal dedicated to showcasing the latest advancements and significant progress in various research areas within the field of physics. The journal's scope is broad, covering a range of topics that include: Quantum computation and quantum information Atomic, molecular, and optical physics Condensed matter physics, material sciences, and interdisciplinary research Particle, nuclear physics, astrophysics, and cosmology The journal's mission is to highlight frontier achievements, hot topics, and cross-disciplinary points in physics, facilitating communication and idea exchange among physicists both in China and internationally. It serves as a platform for researchers to share their findings and insights, fostering collaboration and innovation across different areas of physics.
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