Majorana Fermions and Disclinations in Topological Crystalline   Superconductors
  We prove a topological criterion for the existence of zero-energy Majorana bound-state on a disclination, a rotation symmetry breaking point defect, in 4-fold symmetric topological crystalline superconductors (TCS). We first establish a complete topological classification of TCS using the Chern invariant and three integral rotation invariants. By analytically and numerically studying disclinations, we algebraically deduce a Z_2-index that identifies the parity of the number of Majorana zero-modes at a disclination. Surprisingly, we also find weakly-protected Majorana fermions bound at the corners of superconductors with trivial Chern and weak invariants. 
Jeffrey C. Y. Teo and Taylor L. Hughes
cond-mat.mes-hall cond-mat.str-el cond-mat.supr-con