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

被引:6
作者
Chen, Xiao-Ting [1 ,2 ]
Liu, Chun-Hui [3 ,4 ]
Xu, Dong-Hui [5 ,6 ]
Chen, Chui-Zhen [1 ,2 ]
机构
[1] Soochow Univ, Inst Adv Study, Suzhou 215006, Peoples R China
[2] Soochow Univ, Sch Phys Sci & Technol, Suzhou 215006, Peoples R China
[3] Chinese Acad Sci, Beijing Natl Lab Condensed Matter Phys, Inst Phys, Beijing 100190, Peoples R China
[4] Univ Chinese Acad Sci, Sch Phys Sci, Beijing 100049, Peoples R China
[5] Chongqing Univ, Dept Phys, Chongqing 400044, Peoples R China
[6] Chongqing Univ, Chongqing Key Lab Strongly Coupled Phys, Chongqing 400044, Peoples R China
基金
中国国家自然科学基金;
关键词
NON-ABELIAN STATISTICS; SUPERCONDUCTIVITY; FERMIONS;
D O I
10.1088/0256-307X/40/9/097403
中图分类号
O4 [物理学];
学科分类号
0702 ;
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 higher-order 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.
引用
收藏
页数:6
相关论文
共 117 条
[12]   Three-dimensional superconductors with hybrid higher-order topology [J].
Bultinck, Nick ;
Bernevig, B. Andrei ;
Zaletel, Michael P. .
PHYSICAL REVIEW B, 2019, 99 (12)
[13]   Quantized Conductance of Majorana Zero Mode in the Vortex of the Topological Superconductor (Li0.84Fe0.16)OHFeSe [J].
Chen, C. ;
Liu, Q. ;
Zhang, T. Z. ;
Li, D. ;
Shen, P. P. ;
Dong, X. L. ;
Zhao, Z-X ;
Zhang, T. ;
Feng, D. L. .
CHINESE PHYSICS LETTERS, 2019, 36 (05)
[14]   Higher-Order Topological Insulators in Quasicrystals [J].
Chen, Rui ;
Chen, Chui-Zhen ;
Gao, Jin-Hua ;
Zhou, Bin ;
Xu, Dong-Hui .
PHYSICAL REVIEW LETTERS, 2020, 124 (03)
[15]  
Das A, 2012, NAT PHYS, V8, P887, DOI [10.1038/NPHYS2479, 10.1038/nphys2479]
[16]   Anomalous Zero-Bias Conductance Peak in a Nb-InSb Nanowire-Nb Hybrid Device [J].
Deng, M. T. ;
Yu, C. L. ;
Huang, G. Y. ;
Larsson, M. ;
Caroff, P. ;
Xu, H. Q. .
NANO LETTERS, 2012, 12 (12) :6414-6419
[17]   Topological Switch between Second-Order Topological Insulators and Topological Crystalline Insulators [J].
Ezawa, Motohiko .
PHYSICAL REVIEW LETTERS, 2018, 121 (11)
[18]   Strong and weak second-order topological insulators with hexagonal symmetry and Z3 index [J].
Ezawa, Motohiko .
PHYSICAL REVIEW B, 2018, 97 (24)
[19]   Magnetic second-order topological insulators and semimetals [J].
Ezawa, Motohiko .
PHYSICAL REVIEW B, 2018, 97 (15)
[20]   Higher-Order Topological Insulators and Semimetals on the Breathing Kagome and Pyrochlore Lattices [J].
Ezawa, Motohiko .
PHYSICAL REVIEW LETTERS, 2018, 120 (02)