Topological phases and surface flat bands in superconductors without inversion symmetry
Topological phases and surface flat bands in superconductors without inversion symmetry
We examine different topological phases in three-dimensional noncentrosymmetric superconductors with time-reversal symmetry by using three different types of topological invariants. Due to the bulk boundary correspondence, a nonzero value of any of these topological numbers indicates the appearance of zero-energy Andreev surface states. We find that some of these boundary …