Andreas P. Schnyder, Carsten Timm, P. M. R. Brydon
The spin character of topologically protected edge states in noncentrosymmetric superconductors is investigated through exact diagonalization of Bogoliubov-de Gennes Hamiltonians. We find that due to the spin-orbit coupling and parity-mixing, the edge states exhibit an intricate spin structure, which depends on the edge momentum. If the superconductor is brought into contact with a ferromagnetic insulator, the exchange field coupling to the spin-polarized edge states gives rise to a spontaneous edge current. We study the variation of the zero-temperature edge current on the magnetization direction and the singlet-triplet mixing in the superconductor, and show that it can exhibit singular dependence on the exchange-field strength.
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http://arxiv.org/abs/1302.3461
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