Exotic Topological States with Raman-Induced Spin-Orbit Coupling

Abstract

We propose a simple experimental scheme to realize simultaneously the one-dimensional spin-orbit coupling and the staggered spin-flip in ultracold pseudospin-$1/2$ atomic Fermi gases trapped in square optical lattices. In the absence of interspecies interactions, the system supports gapped Chern insulators and gapless topological semimetal states. By turning on the $s$-wave interactions, a rich variety of gapped and gapless inhomogeneous topological superfluids can emerge. In particular, a gapped topological Fulde-Ferrell superfluid, in which the chiral edge states at opposite boundaries possess the same chirality, is predicted.

arXiv comment11 pages, 6 figures

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Cited by in corpus (5)

• Unpaired topological triply degenerate point for spin-tensor-momentum-coupled ultracold atoms
• Tunable topological phases with fermionic atoms in a one-dimensional flux lattice
• Synthetic spin-orbit coupling for the multispin models in optical lattices
• Tunable symmetry-protected higher-order topological states with fermionic atoms in bilayer optical lattices
• Topological Fulde-Ferrell Superfluids in Triangular Lattices