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Higher-order topological superconductor phases in a multilayer system

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arxiv 2307.13312 v2 pith:5IHXTQLC submitted 2023-07-25 cond-mat.supr-con

Higher-order topological superconductor phases in a multilayer system

classification cond-mat.supr-con
keywords majoranasuperconductorhingephasestopologicalhigher-ordermodesarcs
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Higher-order topological phases are gapped phases of matter that host gapless corner or hinge modes. For the case of superconductors, corner or hinge modes are gapless Majorana modes or Majorana zero modes. To construct 3d higher-order topological superconductors, we consider a topological-insulator/superconductor multilayer under in-plane Zeeman coupling. We found three different types of higher-order topological superconductor phases, a second-order topological superconductor phase with Majorana hinge flat bands, a second-order Dirac superconductor phase with surface Majorana cones and Majorana hinge arcs, and nodal-line superconductor phases with drumhead surface states and Majorana hinge arcs.

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