Proximity-induced unconventional superconductivity in topological insulators

Annica M. Black-Schaffer, Alexander V. Balatsky
2013 Physical Review B  
We study and classify the proximity-induced superconducting pairing in a topological insulator (TI)-superconductor (SC) hybrid structure for SCs with different symmetries. The Dirac surface state gives a coupling between spin-singlet and spin-triplet pairing amplitudes as well as pairing that is odd in frequency for p-wave SCs. We also find that all SCs induce pairing that is odd in both frequency and orbital (band) index, with oddness in frequency and orbital index being completely
more » ... ble. The different induced pairing amplitudes significantly modifies the density of states in the TI surface layer.
doi:10.1103/physrevb.87.220506 fatcat:wrgyk2uoavgdxgod6aoadbfdzi