3He-R: A Topological s Superfluid with Triplet Pairing
Abstract
We show that when spin and orbital angular momenta are entangled by spin-orbit coupling, this transforms a topological spin-triplet superfluid/superconductor state, such as 3He-B, into a topological s state, with non-trivial gapless edge states. Similar to 3He-B, the s state also minimizes on-site Coulomb repulsion for weak to moderate interactions. A topological phase transition into a d-wave state occurs for sufficiently strong spin-orbit coupling.
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