A scheme for realizing nonreciprocal interlayer coupling in bilayer topological systems
作者机构：State Key Laboratory for Mesoscopic Physics and Department of PhysicsCollaborative Innovation Center of Quantum Matter&Frontiers Science Center for Nano-OptoelectronicsBeijing Academy of Quantum Information SciencesPeking UniversityBeijing 100871China Peking University Yangtze Delta Institute of OptoelectronicsNantong 226010China Collaborative Innovation Center of Extreme OpticsShanxi UniversityTaiyuan 030006China Hefei National LaboratoryHefei 230088China College of Mathematics and PhysicsBeijing University of Chemical TechnologyBeijing 100029China
出 版 物：《Frontiers of Optoelectronics》 (光电子前沿（英文版）)
年 卷 期：2023年第16卷第4期
页 面：71-80页
核心收录：
学科分类：07[理学] 0809[工学-电子科学与技术（可授工学、理学学位）] 070205[理学-凝聚态物理] 08[工学] 0827[工学-核科学与技术] 0805[工学-材料科学与工程（可授工学、理学学位）] 080502[工学-材料学] 0701[理学-数学] 0702[理学-物理学]
基 金：supported by the National Natural Science Foundation of China(Nos.91950204,92150302,and 62175009) Innovation Program for Quantum Science and Technology(No.2021ZD0301500) Open Research Fund Program of the State Key Laboratory of Low-Dimensional Quantum Physics(No.KF202114)
主 题：Nonreciprocal Bilayer Interlayer coupling Topological photonics
摘 要：Nonreciprocal interlayer coupling is difcult to practically implement in bilayer non-Hermitian topological photonic *** this work,we identify a similarity transformation between the Hamiltonians of systems with nonreciprocal interlayer coupling and on-site gain/*** similarity transformation is widely applicable,and we show its application in one-and two-dimensional bilayer topological systems as *** bilayer non-Hermitian system with nonreciprocal interlayer coupling,whose topological number can be defned using the gauge-smoothed Wilson loop,is topologically equivalent to the bilayer system with on-site gain/*** also show that the topological number of bilayer non-Hermitian C6v-typed domaininduced topological interface states can be defned in the same way as in the case of the bilayer non-Hermitian Su–Schrieffer–Heeger *** results show the relations between two microscopic provenances of the non-Hermiticity and provide a universal and convenient scheme for constructing and studying nonreciprocal interlayer coupling in bilayer non-Hermitian topological *** scheme is useful for observation of non-Hermitian skin efect in three-dimensional systems.
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