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arXiv · 1204.3639

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

Matthew S. Foster·Emil A. Yuzbashyan
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Abstract

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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Matthew S. Foster, Emil A. Yuzbashyan. 2012-12-11. Interaction-mediated surface state instability in disordered three-dimensional topological superconductors with spin SU(2) symmetry. https://doi.org/10.1103/physrevlett.109.246801

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