Hinge Majorana flat band in type-Ⅱ Dirac semimetals  

作　　者：Yue Xie Xianxin Wu Zhong Fang Zhijun Wang 

机构地区：[1]Beijing National Laboratory for Condensed Matter Physics,and Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China [2]University of Chinese Academy of Sciences,Beijing,100049,China [3]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing,100190,China

出　　处：《Science China(Physics,Mechanics & Astronomy)》2024年第12期127-132,共6页中国科学：物理学、力学、天文学（英文版）

基　　金：supported by the Strategic Priority Research Program of Chinese Academy of Sciences (Grant No.XDB33000000);the National Natural Science Foundation of China (Grant Nos.12188101,52188101;11974395);the Center for Materials Genome;supported by the National Key R&D Program of China (Grant No.2023YFA1407300);the National Natural Science Foundation of China(Grant No.12047503)。

摘　　要：Type-Ⅱ Dirac semimetals exhibit a unique Fermi surface topology,which allows them to host novel topological superconductivity(TSC).We reveal a novel inter-orbital superconducting state,corresponding to the B_(1u) and B_(2u) pairings under the D_(4h) point group.Intriguingly,we find that both first-and second-order TSC coexist in this novel state.It is induced by a dominant inter-orbital attraction and possesses surface helical Majorana cones and hinge Majorana flat bands,spanning the entire z-directed hinge Brillouin zone.Further investigation uncovers that these higher-order hinge modes are robust against the C_(4z) symmetry-breaking perturbation.

关 键 词：topological superconductivity Majorana fermions higher-order topology type-II Dirac semimetals 

分 类 号：O469[理学—凝聚态物理]