Topological mid-gap states of px+ipy topological superconductor with vortex square superlattice

In this paper, the px+ipy topological superconductor with vortex square superlattice is studied. We calculated the edge spectrum in the presence of vortex superlattice, and found that there exist mid-gap vortex fermion bands induced by the vortex superlattice with nontrivial topological properties, which relate to gapless edge mode and non-zero winding number. Moreover, we proposed a topological anisotropic tight-binding Majorana lattice model to describe the mid-gap states.