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Chin. Phys. B, 2023, Vol. 32(2): 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
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.
Keywords:  superconducting topological surface states      chiral symmetry      topological nodal superconductor      Majorana Fermi arc  
Received:  03 February 2022      Revised:  27 April 2022      Accepted manuscript online:  23 May 2022
PACS:  73.20.At (Surface states, band structure, electron density of states)  
  74.20.-z (Theories and models of superconducting state)  
  03.65.Vf (Phases: geometric; dynamic or topological)  
Fund: 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)).
Corresponding Authors:  Xi Luo     E-mail:

Cite this article: 

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 2023 Chin. Phys. B 32 027301

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