Representation-protected topology of spin-singlet s-wave superconductors
Shingo Kobayashi, Akira Furusaki
DOI 10.1103/PhysRevB.110.L100508 · Physical Review B
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Abstract
We show that spin-singlet s-wave multiband superconductors have a topological phase protected by rotation symmetry and time-reversal symmetry without spin-orbit coupling in two and three dimensions. This topological phase, an example of a representation-protected topological phase, has a Z2 topological index and is stable as long as the bands at the Fermi energy are formed by a doublet of orbital states with finite angular momenta. In the limit of weak superconducting pair potential, the Z2 index gives a Fermi-surface formula and is related to the winding number of three-dimensional strong topological superconductors of class CI. We present a model of a topological s±-wave superconductor that has gapless surface states with a quadratic dispersion and suggest a connection with iron-based superconductors.
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