Majorana Corner Modes and Flat-Band Majorana Edge Modes in Superconductor/Topological-Insulator/Superconductor Junctions  

作　　者：陈晓婷 刘春晖 许东辉 陈垂针 Xiao-Ting Chen;Chun-Hui Liu;Dong-Hui Xu;Chui-Zhen Chen(Institute for Advanced Study and School of Physical Science and Technology,Soochow University,Suzhou 215006,China;Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China;School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China;Department of Physics,Chongqing University,Chongqing 400044,China;Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 400044,China)

机构地区：[1]Institute for Advanced Study and School of Physical Science and Technology,Soochow University,Suzhou 215006,China [2]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China [3]School of Physical Sciences,University of Chinese Academy of Sciences,Beijing 100049,China [4]Department of Physics,Chongqing University,Chongqing 400044,China [5]Chongqing Key Laboratory for Strongly Coupled Physics,Chongqing University,Chongqing 400044,China

出　　处：《Chinese Physics Letters》2023年第9期87-92,共6页中国物理快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.12074108,11974256,and 12147102);the Priority Academic Program Development(PAPD)of Jiangsu Higher Education Institution;the Natural Science Foundation of Chongqing(Grant No.CSTB2022NSCQMSX0568)。

摘　　要：Recently,superconductors with higher-order topology have stimulated extensive attention and research interest.Higher-order topological superconductors exhibit unconventional bulk-boundary correspondence,thus allow exotic lower-dimensional boundary modes,such as Majorana corner and hinge modes.However,higher-order topological superconductivity has yet to be found in naturally occurring materials.We investigate higher-order topology in a two-dimensional Josephson junction comprised of two s-wave superconductors separated by a topological insulator thin film.We find that zero-energy Majorana corner modes,a boundary fingerprint of higherorder topological superconductivity,can be achieved by applying magnetic field.When an in-plane Zeeman field is applied to the system,two corner modes appear in the superconducting junction.Furthermore,we also discover a two-dimensional nodal superconducting phase which supports flat-band Majorana edge modes connecting the bulk nodes.Importantly,we demonstrate that zero-energy Majorana corner modes are stable when increasing the thickness of topological insulator thin film.

关 键 词：field TOPOLOGICAL SUPERCONDUCTORS 

分 类 号：O469[理学—凝聚态物理]