Surface Bogoliubov-Dirac cones and helical Majorana hinge modes in superconducting Dirac semimetals

Higher-order topological superconductors and superfluids (SFs) host lower-dimensional Majorana corner and hinge states since novel topology exhibitions on boundaries. While such topological nontrivial phases have been explored extensively, more possible schemes are necessary for engineering Majorana states. In this paper we propose Majorana corner states could be realized in a two-dimensional attractive quantum spin-Hall insulator with opposite in-plane Zeeman energy at two sublattice sites. The appropriate Zeeman field leads to the opposite Dirac mass for adjacent edges of a square sample, and naturally induce Majorana corner states. This topological phase can be characterized by Majorana edge polarizations, and it is robust against perturbations on random potentials and random phase fluctuations as long as the edge gap remains open. Our work provides a new possibility to realize a second-order topological SF in two dimensions and engineer Majorana corner states.

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Time-reversal invariant topological gapped phases in bilayer Dirac materials

Feng

Zhang

Yan

2022

Phys. Rev. B

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Surface Bogoliubov-Dirac cones and helical Majorana hinge modes in superconducting Dirac semimetals

Cited by 13 publications

References 117 publications

Roadmap of the iron-based superconductor Majorana platform

Roadmap of the iron-based superconductor Majorana platform

Majorana corner states in an attractive quantum spin Hall insulator with opposite in-plane Zeeman energy at two sublattice sites

Time-reversal invariant topological gapped phases in bilayer Dirac materials

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