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 

机构地区：[1]Faculty of Materials and Manufacturing,Beijing University of Technology,Beijing 100124,China [2]Department of Electrical and Computer Engineering,National University of Singapore,Singapore 117583,Singapore

出　　处：《Photonics Research》2022年第8期1828-1838,共11页光子学研究（英文版）

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

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 level.Our results reveal a regime of extreme light manipulation and interaction with emerging quantum materials for various practical applications.

关 键 词：SYMMETRY CONTINUUM UNIDIRECTIONAL 

分 类 号：TB383.1[一般工业技术—材料科学与工程]