Paramagnetically induced gapful topological superconductors

Article

关键词: MAJORANA FERMIONS;    INSULATORS;    STATES;    FESE;   

DOI  :  10.1103/PhysRevB.94.054519

来源: SCIE

【 摘 要 】

We propose a generic scenario for realizing gapful topological superconductors (TSCs) from gapless spinsinglet superconductors (SCs). Noncentrosymmetric nodal SCs in two dimensions are shown to be gapful under a Zeeman field, as a result of the cooperation of inversion-symmetry breaking and time-reversal-symmetry breaking. In particular, non-s-wave SCs acquire a large excitation gap. Such paramagnetically induced gapful SCs may be classified into TSCs in the symmetry class D specified by the Chern number. We show nontrivial Chern numbers over a wide parameter range for spin-singlet SCs. A variety of the paramagnetically induced gapful TSCs are demonstrated, including D + p-wave TSC, extended S + p-wave TSC, p + D + f -wave TSC, and s + P-wave TSC. Natural extension toward three-dimensional Weyl SCs is also discussed.

【 授权许可】

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