Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc

doi:10.1088/1674-1056/ac7208

中国物理B ›› 2023, Vol. 32 ›› Issue (2): 27301-027301.doi: 10.1088/1674-1056/ac7208

Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc

Mei-Ling Lu(卢美玲)¹, Yao Wang(王瑶)¹, He-Zhi Zhang(张鹤之)¹, Hao-Lin Chen(陈昊林)¹, Tian-Yuan Cui(崔天元)¹, and Xi Luo(罗熙)^1,2,†

1 College of Science, University of Shanghai for Science and Technology, Shanghai, China;
2 Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China

收稿日期:2022-02-03 修回日期:2022-04-27 接受日期:2022-05-23 出版日期:2023-01-10 发布日期:2023-01-10
通讯作者: Xi Luo E-mail:xiluo@usst.edu.cn
基金资助:
We thank Yue Yu and Ziqiang Wang for helpful discussions. Project supported by the National Natural Science Foundation of China (Grant Nos. 11804223 (MLL, YW, HZZ, HLC, TYC, XL), 11474061 (XL), and 12174067 (XL)).

Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc

Mei-Ling Lu(卢美玲)¹, Yao Wang(王瑶)¹, He-Zhi Zhang(张鹤之)¹, Hao-Lin Chen(陈昊林)¹, Tian-Yuan Cui(崔天元)¹, and Xi Luo(罗熙)^1,2,†

1 College of Science, University of Shanghai for Science and Technology, Shanghai, China;
2 Shanghai Key Laboratory of Modern Optical System, University of Shanghai for Science and Technology, Shanghai, China

Received:2022-02-03 Revised:2022-04-27 Accepted:2022-05-23 Online:2023-01-10 Published:2023-01-10
Contact: Xi Luo E-mail:xiluo@usst.edu.cn
Supported by:
We thank Yue Yu and Ziqiang Wang for helpful discussions. Project supported by the National Natural Science Foundation of China (Grant Nos. 11804223 (MLL, YW, HZZ, HLC, TYC, XL), 11474061 (XL), and 12174067 (XL)).

摘要/Abstract

摘要： With an external in-plane magnetic field, we show the emergence of a topological nodal superconducting phase of the two-dimensional topological surface states. This nodal superconducting phase is protected by the chiral symmetry with a non-zero magnetic field, and there are corresponding Majorana Fermi arcs (also known as flat band Andreev bound states) connecting the two Majorana nodes along the edges, similar to the case of Weyl semimetal. The topological nodal superconductor is an intermediate phase between two different chiral superconductors, and is stable against the effects of substrates. The two-dimensional effective theory of the nodal superconducting phase also captures the low energy behavior of a three-dimensional lattice model which describes the iron-based superconductor with a thin film geometry. The localizations of the Majorana nodes can be manipulated through external in-plane magnetic fields, which may introduce a non-trivial topological Berry phase between them.

关键词: superconducting topological surface states, chiral symmetry, topological nodal superconductor, Majorana Fermi arc

Abstract: With an external in-plane magnetic field, we show the emergence of a topological nodal superconducting phase of the two-dimensional topological surface states. This nodal superconducting phase is protected by the chiral symmetry with a non-zero magnetic field, and there are corresponding Majorana Fermi arcs (also known as flat band Andreev bound states) connecting the two Majorana nodes along the edges, similar to the case of Weyl semimetal. The topological nodal superconductor is an intermediate phase between two different chiral superconductors, and is stable against the effects of substrates. The two-dimensional effective theory of the nodal superconducting phase also captures the low energy behavior of a three-dimensional lattice model which describes the iron-based superconductor with a thin film geometry. The localizations of the Majorana nodes can be manipulated through external in-plane magnetic fields, which may introduce a non-trivial topological Berry phase between them.

Key words: superconducting topological surface states, chiral symmetry, topological nodal superconductor, Majorana Fermi arc

中图分类号: (Surface states, band structure, electron density of states)

73.20.At

74.20.-z (Theories and models of superconducting state) 03.65.Vf (Phases: geometric; dynamic or topological)

Mei-Ling Lu(卢美玲), Yao Wang(王瑶), He-Zhi Zhang(张鹤之), Hao-Lin Chen(陈昊林), Tian-Yuan Cui(崔天元), and Xi Luo(罗熙). Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc[J]. 中国物理B, 2023, 32(2): 27301-027301.

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Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc

Chiral symmetry protected topological nodal superconducting phase and Majorana Fermi arc

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