New Class of Topological Superconductors Protected by Magnetic Group Symmetries

作者：Fang Chen^*; Gilbert Matthew J; Bernevig B Andrei

来源：Physical Review Letters, 2014, 112(10): 106401.

DOI：10.1103/PhysRevLett.112.106401

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 Z(2) 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.

• 出版日期2014-3-10