3 1 M ar 2 01 2 Surface Spectral Function of Momentum-dependent Pairing Potentials in a Topological Insulator : Application to Cu x Bi 2 Se

We propose three possible momentum-dependent pairing potentials for candidate of topological superconductor (for example CuxBi2Se3), and calculate the surface spectral function and surface density of state with these pairing potentials. We find that the first two can give the same spectral functions as the fully-gapped and node-contacted pairing potentials given in [Phys. Rev. Lett. 105, 097001], and that the third one can obtain topological non-trivial case which exists flat Andreev bound state and preserves the C3 rotation symmetry. We hope our proposals and results be judged by future experiment.