期刊
NEW JOURNAL OF PHYSICS
卷 24, 期 8, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1367-2630/ac8306
关键词
nodal-line semimetal; topological superconductor; fragile topology; Majorana zero modes
资金
- NSFC [12074130]
- Natural Science Foundation of Guangdong Province [2021A1515012340]
- Science and Technology Program of Guangzhou [202102080434]
The fragile topological superconducting system can be realized in inversion symmetric odd parity superconducting nodal line semimetal materials, generating surface or edge states with zero modes. The results of vortex bound states strongly depend on the specific systems studied.
The fragile topological phase is an exotic phase with unstable edge states. Its nontrivial band topology can be removed by coupling to additional topologically trivial bands. Here we reveal that the fragile band topology can be realized in the inversion symmetric odd parity superconducting nodal line semimetal (SC-NLSM) materials with and without the spin orbital coupling. Without the spin orbital coupling, both the s-wave SC-NLSM and the p-wave SC-NLSM host a pair of Majorana zero modes on the system surface. For the spinful case, it has fourfold inverted bands and generates fourfold degenerate Majorana surface/edge states. However, we verify that for all of the systems we considered, they belong to the fragile topological superconducting system based on the Wilson loop method. The vortex bound states are studied numerically and the results depend strongly on the systems.
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