Topological multiband s-wave superconductivity in coupled multifold fermions

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 $s_{+}\oplus s_{-}$ gap function, which is $\mathbf{k}$ 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.

6+12 pages, 3+4 figures

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Cited by in corpus (2)

• Discovery of nodal-line superconductivity in chiral crystals
• Fermi surface and topology of multiband superconductor BeAu