Anisotropic Superfluidity in the Two-Species Polar Fermi Gas

Abstract

We study the superfluid pairing in a two-species gas of heteronuclear fermionic molecules with equal density. The interplay of the isotropic s-wave interaction and anisotropic long-range dipolar interaction reveals rich physics. We find that the single-particle momentum distribution has a characteristic ellipsoidal shape that can be reasonably represented by a deformation parameter $\alpha$ defined similarly to the normal phase. Interesting momentum-dependent features of the order parameter are identified. We calculate the critical temperatures of both the singlet and triplet superfluid, suggesting a possible pairing symmetry transition by tuning the s-wave or dipolar interaction strength.

4 pages, 5 figures

References in corpus (9)

• Theory of ultracold Fermi gases
• A High Phase-Space-Density Gas of Polar Molecules
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Resonantly-paired fermionic superfluids
• Observation of pseudogap behavior in a strongly interacting Fermi gas
• Ultracold dense gas of deeply bound heteronuclear molecules
• Phase space deformation of a trapped dipolar Fermi gas
• Thermodynamics and coherence of a trapped dipolar Fermi gas
• Nonuniform mixed-parity superfluid state in Fermi gases

Cited by in corpus (4)

• Fermion Pairing across a Dipolar Interaction Induced Resonance
• Second-order interaction corrections to the Fermi surface and the quasiparticle properties of dipolar fermions in three dimensions
• A local exchange theory for trapped dipolar gases
• Effect of short-range interaction for collision of ultracold dipoles