Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices

Abstract

Spin-imbalanced ultracold Fermi gases have been widely studied recently as a platform for exploring the long-sought Fulde-Ferrell-Larkin-Ovchinnikov superfluid phases, but so far conclusive evidence has not been found. Here we propose to realize an Fulde-Ferrell (FF) superfluid without spin imbalance in a three-dimensional fermionic cold atom optical lattice, where $s$- and $p$-orbital bands of the lattice are coupled by another weak moving optical lattice. Such coupling leads to a spin-independent asymmetric Fermi surface, which, together with the $s$-wave scattering interaction between two spins, yields an FF type of superfluid pairing. Unlike traditional schemes, our proposal does not rely on the spin imbalance (or an equivalent Zeeman field) to induce the Fermi surface mismatch and provides a completely new route for realizing FF superfluids.

6 pages, 4 figures

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Cited by in corpus (14)

• The Fulde-Ferrell-Larkin-Ovchinnikov state for ultracold fermions in lattice and harmonic potentials: a review
• Spin-momentum coupled Bose-Einstein condensates with lattice band pseudospins
• Exotic Vortex States with Discrete Rotational Symmetry in Atomic Fermi Gases with Spin-Orbital-Angular-Momentum Coupling
• Fulde-Ferrell Superfluids without Spin Imbalance in Driven Optical Lattices
• Self-adapted Floquet Dynamics of Ultracold Bosons in a Cavity
• Synthetic-gauge-field-induced resonances and Fulde-Ferrell-Larkin-Ovchinnikov states in a one-dimensional optical lattice
• Feasibility of a Fulde-Ferrell-Larkin-Ovchinnikov superfluid Fermi atomic gas
• Proposed Fermi-surface reservoir-engineering and application to realizing unconventional Fermi superfluids in a driven-dissipative non-equilibrium Fermi gas
• Effective Hamiltonian with tunable mixed pairing in driven optical lattices
• Cavity-induced Fulde-Ferrell-Larkin-Ovchinnikov superfluids of ultracold Fermi gases
• Dynamical instability towards finite-momentum pairing in quenched BCS superconducting phases
• Fulde-Ferrell superfluids in spinless ultracold Fermi gases
• Larkin-Ovchinikov superfluidity in time-reversal symmetric bilayer Fermi gases
• Engineering nonequilibrium superconducting phases in a voltage-driven superconductor under an external magnetic field