Accurate projective two-band description of topological superfluidity in spin-orbit-coupled Fermi gases

Abstract

The interplay of spin-orbit coupling and Zeeman splitting in ultracold Fermi gases gives rise to a topological superfluid phase in two spatial dimensions that can host exotic Majorana excitations. Theoretical models have so far been based on a four-band Bogoliubov-de Gennes formalism for the combined spin-1/2 and particle-hole degrees of freedom. Here we present a simpler, yet accurate, two-band description based on a well-controlled projection technique that provides a new platform for exploring analogies with chiral p-wave superfluidity and detailed future studies of spatially non-uniform situations.

arXiv comment22 pages, 7 figures, SciPost style

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Cited by in corpus (5)

• Majorana Doublets, Flat Bands, and Dirac Nodes in s-Wave Superfluids
• Chiral twodimensional p-wave superfluid from s-wave pairing in the BEC regime
• Coexistence of topological and nontopological Fermi-superfluid phases
• Non-Abelian Majorana fermions in topological $s$-wave Fermi superfluids
• Andreev bound states at boundaries of polarized 2D Fermi superfluids with s-wave pairing and spin-orbit coupling