New class of topological superconductors protected by magnetic group symmetries

Chen Fang; Matthew J. Gilbert; B. Andrei Bernevig

doi:10.1103/PhysRevLett.112.106401

New class of topological superconductors protected by magnetic group symmetries

Chen Fang, Matthew J. Gilbert, B. Andrei Bernevig

Research output: Contribution to journal › Article › peer-review

Abstract

We study a new type of three-dimensional topological superconductor that exhibits Majorana zero modes (MZM) protected by a magnetic group symmetry, a combined antiunitary symmetry composed of a mirror reflection and time reversal. This new symmetry enhances the noninteracting topological classification of a superconducting vortex from Z2 to Z, indicating that multiple MZMs can coexist at the end of one magnetic vortex of unit flux. Especially, we show that a vortex binding two MZMs can be realized on the (001) surface of a topological crystalline insulator SnTe with proximity induced BCS Cooper pairing, or in bulk superconductor InxSn1-xTe.

Original language	English (US)
Article number	106401
Journal	Physical review letters
Volume	112
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevLett.112.106401
State	Published - Mar 10 2014

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General Physics and Astronomy

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10.1103/PhysRevLett.112.106401

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New class of topological superconductors protected by magnetic group symmetries

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