Interaction-mediated surface state instability in disordered three-dimensional topological superconductors with spin SU(2) symmetry

Details Interaction-mediated surface state instability in disordered three-dimensional topological superconductors with spin SU(2) symmetry Interaction-mediated surface state instability in disordered three-dimensional topological superconductors with spin SU(2) symmetry

2012-04-16

arxiv.org/abs/1204.3639v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

5 pages, 1 figure

Scientific paper

We show that arbitrarily weak interparticle interactions destabilize the surface states of 3D topological superconductors with spin SU(2) invariance (symmetry class CI), in the presence of non-magnetic disorder. The conduit for the instability is disorder-induced wavefunction multifractality. We argue that time-reversal symmetry breaks spontaneously at the surface, so that topologically-protected states do not exist for this class. The interaction-stabilized surface phase is expected to exhibit ferromagnetic order, or to reside in an insulating plateau of the spin quantum Hall effect.

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