Continuous evolution of Fermi arcs in a minimal ideal photonic Weyl medium  

作　　者：Yachao Liu Mingwei Wang Yongqing Huang Guo Ping Wang Shuang Zhang 

机构地区：[1]State Key Laboratory of Radio Frequency Heterogeneous Integration,College of Electronics and Information Engineering,Shenzhen University,Shenzhen 518060,China [2]Institute of Microscale Optoelectronics,Shenzhen University,Shenzhen 518060,China [3]Department of Physics,University of Hong Kong,Hong Kong,China [4]Department of Electrical&Electronic Engineering,University of Hong Kong,Hong Kong,China

出　　处：《Light(Science & Applications)》2024年第11期2794-2801,共8页光（科学与应用)（英文版）

基　　金：supported in part by the National Key Research and Development Program of China(no.2022YFA1404500);the National Natural Science Foundation of China(NSFC)(nos.12274302 and 12434017);the Hong Kong Research Grant Council(AoE/P-502/20,17309021).

摘　　要：Propagation properties of electromagnetic waves in an optical medium are mainly determined by the contour of equal-frequency states in k-space.In photonic Weyl media,the topological surface waves lead to a unique open arc of the equal-frequency contour,called the Fermi arc.However,for most realistic Weyl systems,the shape of Fermi arcs is fixed due to the constant impedance of the surrounding medium,making it difficult to manipulate the surface wave.Here we demonstrate that by adjusting the thickness of the air layer sandwiched between two photonic Weyl media,the shape of the Fermi arc can be continuously changed from convex to concave.Moreover,we show that the concave Fermi-arc waves can be used to achieve topologically protected electromagnetic pulling forces over a broad range of angles in the air layer.Our finding offers a generally applicable strategy to shape the Fermi arc in photonic Weyl media.

关 键 词：wave FERMI TOPOLOGICAL 

分 类 号：O441[理学—电磁学]