Unidirectional bound states in the continuum in Weyl semimetal nanostructures

作     者：CHEN ZHAO GUANGWEI HU YANG CHEN QING ZHANG YONGZHE ZHANG CHENG-WEI QIU CHEN ZHAO;GUANGWEI HU;YANG CHEN;QING ZHANG;YONGZHE ZHANG;CHENG-WEI QIU

作者机构：Faculty of Materials and ManufacturingBeijing University of TechnologyBeijing 100124China Department of Electrical and Computer EngineeringNational University of SingaporeSingapore 117583Singapore 

出 版 物：《Photonics Research》 (光子学研究（英文版）)

年 卷 期：2022年第10卷第8期

页      面：1828-1838页

核心收录：

学科分类：07[理学] 070205[理学-凝聚态物理] 08[工学] 080501[工学-材料物理与化学] 0805[工学-材料科学与工程（可授工学、理学学位）] 0702[理学-物理学] 

基　　金：National Natural Science Foundation of China(61922005,U1930105) Agency for Science,Technology and Research(1527000014) 

主　　题：symmetry continuum unidirectional 

摘      要：Recently studied bound states in the continuum(BICs) enable perfect localization of light and enhance light–matter interactions although systems are optically open. They have found applications in numerous areas,including optical nonlinearity, light emitters, and nano-sensors. However, their unidirectional nature in nonreciprocal devices is still elusive because such trapping states are easily destroyed when the symmetry of an optical system is broken. Herein, we propose nonreciprocal and dynamically tunable BICs for unidirectional confinement of light and symmetry-protected BICs at Γ-point by introducing antiparallel magnetism into the optical system. We demonstrate that such BICs can be achieved by using topological magnetic Weyl semimetals near zero-index frequency without any structural asymmetry, and are largely tunable via modifying the Fermi *** results reveal a regime of extreme light manipulation and interaction with emerging quantum materials for various practical applications.