1210.5412 (C. W. J. Beenakker et al.)

Fermion-parity anomaly of the critical supercurrent in the quantum
spin-Hall effect    [PDF]

C. W. J. Beenakker, D. I. Pikulin, T. Hyart, J. P. Dahlhaus

The helical edge state of a quantum spin-Hall insulator can carry a supercurrent in equilibrium between two superconducting electrodes (separation L, coherence length xi). We calculate the maximum (critical) current I_c that can flow without dissipation along a single edge, going beyond the short-junction restriction L<View original: http://arxiv.org/abs/1210.5412