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Superconductive proximity in a topological insulator slab and excitations bound to an axial vortex
We consider the proximity effect in a topological insulator (TI) sandwiched between two conventional superconductors by comparing $s$-wave spin singlet superconducting pairing correlations and odd-parity triplet pairing correlations with a zero spin component orthogonal to the slab (``polar'' phase). A superconducting gap opens in the Dirac dispersion of the surface …