Swallowtail Structure in Fermi Superfluids with Periodically Modulated Interactions

Abstract

We study the superfluid flow in a quasi-one-dimensional Fermi gas with spatially modulated interactions induced by an optical Feshbach resonance. Due to the competition between the periodicity of the modulated interaction and the nonlinearity of the background interaction, an interesting swallowtail structure emerges in the energy spectrum under appropriate parameters. As the interaction strengths are tuned, the swallowtail structure may disappear, giving rise to various different states on a rich phase diagram. We investigate the spatial distribution of the order parameter and the particle density under various parameters, which are useful for the experimental detection of the interesting phases in these systems.

7 pages, 5 figures

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• FFLO state in 1, 2, and 3 dimensional optical lattices combined with a non-uniform background potential
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Cited by in corpus (4)

• Nonlinear dynamics of a spin-orbit-coupled Bose-Einstein condensate
• Nonlinear Phenomena of Ultracold Atomic Gases in Optical Lattices: Emergence of Novel Features in Extended States
• Analytical results for the superflow of spin-orbit-coupled Bose-Einstein condensates in optical lattices
• Stabilization of Nonlinear Lattices: A Route to Superfluidity and Hysteresis