Physics – Condensed Matter – Superconductivity
Scientific paper
2011-01-14
Phys. Rev. B 83, 184511 (2011)
Physics
Condensed Matter
Superconductivity
8 pages, 10 figures; references added in v2
Scientific paper
10.1103/PhysRevB.83.184511
We present microscopic, self-consistent calculations of the superconducting order parameter and pairing correlations near the interface of an $s$-wave superconductor and a three-dimensional topological insulator with spin-orbit coupling. We discuss the suppression of the order parameter by the topological insulator and show that the equal-time pair correlation functions in the triplet channel, induced by spin-flip scattering at the interface, are of $p_x\pm i p_y$ symmetry. We verify that the spectrum at sub-gap energies is well described by the Fu-Kane model. The sub-gap modes are viewed as interface states with spectral weight penetrating well into the superconductor. We extract the phenomenological parameters of the Fu-Kane model from microscopic calculations, and find they are strongly renormalized from the bulk material parameters. This is consistent with previous results of Stanescu et al for a lattice model using perturbation theory in the tunneling limit.
Lababidi Mahmoud
Zhao Erhai
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