3 He-R : A topological s ± superfluid with triplet pairing
/ Authors
/ 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 $^{3}$He-B, into a topological $s^{\pm}$ state, with non-trivial gapless edge states. Similar to $^{3}$He-B, the $s^{\pm}$ 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.
Journal: Physical Review B