{"title":"Topological phase transitions and switchable edge states for the non-Hermitian Aubry-André-Harper model in photonic crystals.","authors":"Luchi Wang, Jie Tang, Xiaoyu Dai, Yuanjiang Xiang","doi":"10.1364/OL.554513","DOIUrl":null,"url":null,"abstract":"<p><p>The Aubry-André-Harper (AAH) model with imaginary periodic or quasiperiodic modulations could regulate the local properties of the system. In this work, we apply the non-Hermitian AAH potential field to the photonic system induced by gain and loss. It is found that the potential field with different parameters will cause the system to exhibit different local properties and induce different localized edge states under the open boundary conditions. Moreover, we investigated the influence of non-Hermitian AAH potential parameters on the edge states of the Haldane model under periodic boundary conditions. It is shown that two-dimensional magnetic photonic crystals can undergo topological transitions and switchable edge states by tuning the potential field parameters. This offers a versatile method for controlling optical flow in photonic platforms.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 3","pages":"1053-1056"},"PeriodicalIF":3.3000,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Optics letters","FirstCategoryId":"101","ListUrlMain":"https://doi.org/10.1364/OL.554513","RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"OPTICS","Score":null,"Total":0}
引用次数: 0
Abstract
The Aubry-André-Harper (AAH) model with imaginary periodic or quasiperiodic modulations could regulate the local properties of the system. In this work, we apply the non-Hermitian AAH potential field to the photonic system induced by gain and loss. It is found that the potential field with different parameters will cause the system to exhibit different local properties and induce different localized edge states under the open boundary conditions. Moreover, we investigated the influence of non-Hermitian AAH potential parameters on the edge states of the Haldane model under periodic boundary conditions. It is shown that two-dimensional magnetic photonic crystals can undergo topological transitions and switchable edge states by tuning the potential field parameters. This offers a versatile method for controlling optical flow in photonic platforms.
期刊介绍：
The Optical Society (OSA) publishes high-quality, peer-reviewed articles in its portfolio of journals, which serve the full breadth of the optics and photonics community.
Optics Letters offers rapid dissemination of new results in all areas of optics with short, original, peer-reviewed communications. Optics Letters covers the latest research in optical science, including optical measurements, optical components and devices, atmospheric optics, biomedical optics, Fourier optics, integrated optics, optical processing, optoelectronics, lasers, nonlinear optics, optical storage and holography, optical coherence, polarization, quantum electronics, ultrafast optical phenomena, photonic crystals, and fiber optics. Criteria used in determining acceptability of contributions include newsworthiness to a substantial part of the optics community and the effect of rapid publication on the research of others. This journal, published twice each month, is where readers look for the latest discoveries in optics.
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