Topological multiband s-wave superconductivity in coupled multifold fermions
Changhee Lee, Chiho Yoon, Taehyeok Kim, Suk Bum Chung, Hongki Min
DOI 10.1103/PhysRevB.104.L241115 · Physical Review B
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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+⊕s− gap function, which is 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.
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