Tri-Dirac surface modes in topological superconductors
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PhysRevB.91.165421.pdf
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341.15 KB
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Author(s)
Fang, Chen
Bernevig, B. Andrei
Gilbert, Matthew J.
Date Issued
April 2015
Journal
Physical Review B
Publisher
American Physical Society
Citation
Fang, Chen, B. Andrei Bernevig, and Matthew J. Gilbert. "Tri-Dirac surface modes in topological superconductors." Phys. Rev. B 91, 165421 (April 2015). © 2015 American Physical Society
Version
Final published version
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 [superscript 3]He-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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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DOI of Published Version
https://doi.org/10.1103/PhysRevB.91.165421
