Topological Mid-gap States of px+ipy Topological Superconductor with   Vortex superlattice
  In this paper, the px+ipy topological superconductor with vortex superlattice is studied. We found that there exist mid-gap energy bands induced by the vortex superlattice and the mid-gap energy bands have nontrivial topological properties including the gapless edge states and non-zero winding number. An topological anisotropic tight-binding Majorana lattice model is proposed to describe the mid-gap states. 
Jiang Zhou, Shi-Zhu Wang, Ya-Jie Wu, Rong-Wu Li, and Su-Peng Kou
cond-mat.supr-con cond-mat.mes-hall