1205.1441 (I. C. Fulga et al.)

Thermal metal-insulator transition in a helical topological
superconductor    [PDF]

I. C. Fulga, A. R. Akhmerov, J. Tworzydło, B. Béri, C. W. J. Beenakker

Two-dimensional superconductors with time-reversal symmetry have a Z_2 topological invariant, that distinguishes phases with and without helical Majorana edge states. We study the topological phase transition in a class-DIII network model, and show that it is associated with a metal-insulator transition for the thermal conductance of the helical superconductor. The localization length diverges at the transition with critical exponent nu approx 2.0, about twice the known value in a chiral superconductor.

View original: http://arxiv.org/abs/1205.1441