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

Author(s): Laumann, Chris R; Ludwig, Andreas WW; Huse, David A; Trebst, Simon

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Abstract: 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 ν=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.
Publication Date: Apr-2012
Electronic Publication Date: 11-Apr-2012
Citation: Laumann, Chris R, Ludwig, Andreas WW, Huse, David A, Trebst, Simon. (2012). Disorder-induced Majorana metal in interacting non-Abelian anyon systems. Physical Review B, 85 (16), 10.1103/PhysRevB.85.161301
DOI: doi:10.1103/PhysRevB.85.161301
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: Physical Review B
Version: Author's manuscript

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