Thermal metal-insulator transition in a helical topological   superconductor
  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. 
I. C. Fulga, A. R. Akhmerov, J. Tworzyd{\l}o, B. B\'eri and C. W. J.   Beenakker
cond-mat.mes-hall