Anisotropic magnetic responses of topological crystalline   superconductors
  Majorana Kramers pairs emerged on surfaces of time-reversal-invariant topological crystalline superconductors show the Ising anisotropy to an applied magnetic field. We clarify that crystalline symmetry uniquely determines the direction of the Majorana Ising spin for given irreducible representations of pair potential, deriving constraints to topological invariants. Besides, necessary conditions for nontrivial topological invariants protected by the n-fold rotational symmetry are shown. 
Yuansen Xiong, Ai Yamakage, Shingo Kobayashi, Masatoshi Sato, and   Yukio Tanaka
cond-mat.mes-hall cond-mat.supr-con