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.
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)
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)。
