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.
作者
卢美玲
王瑶
张鹤之
陈昊林
崔天元
罗熙
Mei-Ling Lu;Yao Wang;He-Zhi Zhang;Hao-Lin Chen;Tian-Yuan Cuil;Xi Luo(College of Science,University of Shanghai for Science and Technology,Shanghai,China;Shanghai Key Laboratory of Moderm Optical System,University of Shanghai for Science and Technology,Shanghai,China)
基金
supported by the National Natural Science Foundation of China (Grant Nos. 11804223 (MLL, YW, HZZ, HLC, TYC, XL), 11474061 (XL), and 12174067 (XL))。
