Topological multiband s-wave superconductivity in coupled multifold fermions
arXiv:2103.12630 · doi:10.1103/PhysRevB.104.L241115
Abstract
We study three-dimensional time-reversal-invariant topological superconductivity in noncentrosymmetric materials such as RhSi, CoSi, and AlPt which host coupled multifold nodes energetically split by the spin-orbit coupling at the same time-reversal-invariant momentum (TRIM). The topological superconductivity arises from the gap function, which is independent, but with opposite signs for the two nodes split at the same TRIM. We consider various electron-electron interactions in the tight-binding model for RhSi and find that the topological superconducting phase supporting a surface Majorana cone and topological nodal rings is favored in a wide range of interaction parameters.
arXiv comment6+12 pages, 3+4 figures
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