YongLiang Song, Shu-Xiu Shang, Xinlian Chen, C W Zhang, Shu-Feng Zhang
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rameter space of uncorrelated Anderson disorder and Zeeman splitting energy. In the absence of
 disorder, the system undergoes the phases of higher-order topological insulators (HOTIs), Chern
 insulators (CIs) with Chern numbers C = 2 and C = 1, and band insulators successively with
 enhancing Zeeman energy. The phase boundary separating these phases is found to be strongly
 deformed by the disorder, which leads to several topological Anderson insulators. Specifically, there
 exist phase transitions between CI with C = 2 and HOTI, and between CIs with C = 1 and C = 2.
 For the former one, it is in fact a phase transition between first-order and second-order topological
 phases. Besides, these disorder induced phase transitions are well explained by self-consistent Born
 approximation.</p>","PeriodicalId":16776,"journal":{"name":"Journal of Physics: Condensed Matter","volume":" ","pages":""},"PeriodicalIF":2.3000,"publicationDate":"2024-12-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Journal of Physics: Condensed Matter","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1088/1361-648X/ad9fc9","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, CONDENSED MATTER","Score":null,"Total":0}
引用次数: 0
摘要
我们研究了一个二维磁拓扑系统在不相关的安德森无序和泽曼分裂能的pa
rameter空间中的相图。在没有
无序的情况下,该体系经历了高阶拓扑绝缘体(HOTIs)、切尔诺数为 C = 2 和 C = 1 的切尔诺绝缘体(CIs)以及带状绝缘体(Zeeman 能量相继增强)等阶段。研究发现,分隔这些相的相边界会因无序而发生强烈变形,从而产生几种拓扑安德森绝缘体。具体来说,在 C = 2 的 CI 与 HOTI 之间以及 C = 1 与 C = 2 的 CI 之间存在相变。此外,这些无序诱导的相变可以很好地用自洽的 Born
近似来解释。
Disorder-induced phase transitions in a two-dimensional magnetic topological insulator system.
We investigate the phase diagram of a two-dimensional magnetic topological system in the pa
rameter space of uncorrelated Anderson disorder and Zeeman splitting energy. In the absence of
disorder, the system undergoes the phases of higher-order topological insulators (HOTIs), Chern
insulators (CIs) with Chern numbers C = 2 and C = 1, and band insulators successively with
enhancing Zeeman energy. The phase boundary separating these phases is found to be strongly
deformed by the disorder, which leads to several topological Anderson insulators. Specifically, there
exist phase transitions between CI with C = 2 and HOTI, and between CIs with C = 1 and C = 2.
For the former one, it is in fact a phase transition between first-order and second-order topological
phases. Besides, these disorder induced phase transitions are well explained by self-consistent Born
approximation.
期刊介绍:
Journal of Physics: Condensed Matter covers the whole of condensed matter physics including soft condensed matter and nanostructures. Papers may report experimental, theoretical and simulation studies. Note that papers must contain fundamental condensed matter science: papers reporting methods of materials preparation or properties of materials without novel condensed matter content will not be accepted.