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Lattice Model of a Three-Dimensional Topological Singlet Superconductor with Time-Reversal Symmetry
We study topological phases of time-reversal invariant singlet superconductors in three spatial dimensions. In these systems the topological phases are characterized by an even-numbered winding number nu. At the surface the topological properties of this quantum state manifest themselves through the presence of nu flavors of gapless Dirac fermion surface …