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Tri-Dirac surface modes in topological superconductors

Author(s): Fang, Chen; Bernevig, Bogdan A.; Gilbert, Matthew J

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Abstract: We propose a new type of topological surface modes having cubic dispersion in three-dimensional topological superconductors. Lower order dispersions are prohibited by the threefold rotational symmetry and time-reversal symmetry. Cooper pairing in the bulk changes sign under improper rotations, akin to He-3-B. The surface manifestations are a divergent surface density of states at the Fermi level and isospins that rotate three times as they circle the origin in momentum space. We propose that Heusler alloys with band inversion are candidate materials to harbor the novel topological superconductivity.
Publication Date: 20-Apr-2015
Electronic Publication Date: 20-Apr-2015
Citation: Fang, Chen, Bernevig, B Andrei, Gilbert, Matthew J. (2015). Tri-Dirac surface modes in topological superconductors. PHYSICAL REVIEW B, 91 (10.1103/PhysRevB.91.165421
DOI: doi:10.1103/PhysRevB.91.165421
ISSN: 1098-0121
EISSN: 1550-235X
Type of Material: Journal Article
Journal/Proceeding Title: PHYSICAL REVIEW B
Version: Final published version. Article is made available in OAR by the publisher's permission or policy.

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