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
[1]   Milestones Toward Majorana-Based Quantum Computing [J].
Aasen, David ;
Hell, Michael ;
Mishmash, Ryan V. ;
Higginbotham, Andrew ;
Danon, Jeroen ;
Leijnse, Martin ;
Jespersen, Thomas S. ;
Folk, Joshua A. ;
Marcus, Charles M. ;
Flensberg, Karsten ;
Alicea, Jason .
PHYSICAL REVIEW X, 2016, 6 (03)
[2]   Higher-order topological superconductivity of spin-polarized fermions [J].
Ahn, Junyeong ;
Yang, Bohm-Jung .
PHYSICAL REVIEW RESEARCH, 2020, 2 (01)
[3]   Wilson-loop characterization of inversion-symmetric topological insulators [J].
Alexandradinata, A. ;
Dai, Xi ;
Bernevig, B. Andrei .
PHYSICAL REVIEW B, 2014, 89 (15)
[4]   New directions in the pursuit of Majorana fermions in solid state systems [J].
Alicea, Jason .
REPORTS ON PROGRESS IN PHYSICS, 2012, 75 (07)
[5]  
Alicea J, 2011, NAT PHYS, V7, P412, DOI [10.1038/nphys1915, 10.1038/NPHYS1915]
[6]  
[Anonymous], SUPPLEMENTARY MAT DE
[7]   Search for Majorana Fermions in Superconductors [J].
Beenakker, C. W. J. .
ANNUAL REVIEW OF CONDENSED MATTER PHYSICS, VOL 4, 2013, 4 :113-136
[8]   Electric multipole moments, topological multipole moment pumping, and chiral hinge states in crystalline insulators [J].
Benalcazar, Wladimir A. ;
Bernevig, B. Andrei ;
Hughes, Taylor L. .
PHYSICAL REVIEW B, 2017, 96 (24)
[9]   Quantized electric multipole insulators [J].
Benalcazar, Wladimir A. ;
Bernevig, B. Andrei ;
Hughes, Taylor L. .
SCIENCE, 2017, 357 (6346) :61-66
[10]  
Bernevig B., 2013, Topological insulators and topological superconductors, DOI DOI 10.1515/9781400846733