Tri-Dirac surface modes in topological superconductors
Author(s)Fang, Chen; Bernevig, B. Andrei; Gilbert, Matthew J.
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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.
DepartmentMassachusetts Institute of Technology. Department of Physics
Physical Review B
American Physical Society
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
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