Disorder-induced Majorana metal in interacting non-Abelian anyon systems

Details Disorder-induced Majorana metal in interacting non-Abelian anyon systems Disorder-induced Majorana metal in interacting non-Abelian anyon systems

2011-06-30

arxiv.org/abs/1106.6265v2

Phys. Rev. B 85, 161301(R) (2012)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 6 figures

Scientific paper

10.1103/PhysRevB.85.161301

We demonstrate that a thermal metal of Majorana fermions forms in a two-dimensional system of interacting non-Abelian (Ising) anyons in the presence of moderate disorder. This bulk metallic phase arises in the $\nu=5/2$ quantum Hall state when disorder pins the anyonic quasiparticles. More generally, it naturally occurs for various proposed systems supporting Majorana fermion zero modes when disorder induces the random pinning of a finite density of vortices. This includes all two-dimensional topological superconductors in so-called symmetry class D. A distinct experimental signature of the thermal metal phase is the presence of bulk heat transport down to zero temperature.

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