Fermion Pairing across a Dipolar Interaction Induced Resonance

Abstract

It is known from the solution of the two-body problem that an anisotropic dipolar interaction can give rise to s-wave scattering resonances, which are named as dipolar interaction induced resonaces (DIIR). In this letter, we study zero-temperature many-body physics of a two-component Fermi gas across a DIIR. In the low-density regime, it is very striking that the resulting pairing order parameter is a nearly isotropic singlet pairing and the physics can be well described by an s-wave resonant interaction potential with finite range corrections, despite of the anisotropic nature of dipolar interaction. The pairing energy is as strong as a unitary Fermi gas nearby a magnetic Feshbach resonance. In the high density regime, the anisotropic effect plays an important role. We find phase transitions from singlet pairing to a state with mixed singlet and triplet pairing, and then from mixed pairing to pure triplet pairing. The state with mixed pairing spontaneously breaks the time-reversal symmetry.

4.5 pages, 4 figures, figures updated, minor changes in text

References in corpus (23)

• Theory of ultracold Fermi gases
• A High Phase-Space-Density Gas of Polar Molecules
• Spinor Bose Condensates in Optical Traps
• Controlling the hyperfine state of rovibronic ground-state polar molecules
• Stable Topological Superfluid Phase of Ultracold Polar Fermionic Molecules
• Controlling atom-atom interaction at ultralow temperatures by dc electric fields
• Superfluid pairing in a polarized dipolar Fermi gas
• Phase space deformation of a trapped dipolar Fermi gas
• Prospects for p-wave paired BCS states of fermionic atoms
• Ferro-Nematic ground state of the dilute dipolar Fermi gas
• Anisotropic Fermi liquid theory of the ultra cold fermionic polar molecules: Landau parameters and collective modes
• Low energy atomic collision with dipole interactions
• Effective-Range Dependence of Resonantly Interacting Fermions
• Long range scattering resonances in strong-field seeking states of polar molecules
• Mixed triplet and singlet pairing in multicomponent ultracold fermion systems with dipolar interactions
• Singlet and triplet BCS pairs in a gas of two-species fermionic polar molecules
• Low-energy resonances and bound states of aligned bosonic and fermionic dipoles
• Fermi surface of a trapped dipolar Fermi gas
• Universal resonant ultracold molecular scattering
• Resonance phenomena in ultracold dipole-dipole scattering
• Ultra-cold Fermi gases with resonant dipole-dipole interaction
• s-Wave Scattering Resonances Induced by Dipolar Interactions of Polar Molecules
• Anisotropic Superfluidity in the Two-Species Polar Fermi Gas

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• Variational Study of Fermionic and Bosonic Systems with Non-Gaussian States: Theory and Applications
• Weyl Superfluidity in a Three-dimensional Dipolar Fermi Gas
• Effective potential and superfluidity of microwave-dressed polar molecules
• Bound states and expansion dynamics of interacting bosons on a one-dimensional lattice
• Tuning between singlet, triplet, and mixed pairing states in an extended Hubbard chain
• Dipolar-Induced Resonance for Ultracold Bosons in a Quasi-1D Optical Lattice
• Fermion superfluid with hybridized $s$- and $p$-wave pairings
• Quasi-One-Dimensional Dipolar Quantum Gases
• Observing dipolar confinement-induced resonances in waveguides
• Unconventional symmetries of Fermi liquid and Cooper pairing properties with electric and magnetic dipolar fermions
• Reentrant Superfluidity and Pair Density Wave in Single Component Dipolar Fermi Gases
• Exact two-body solutions and Quantum defect theory of two dimensional dipolar quantum gas
• Triplet Superfluidity on a triangular ladder with dipolar fermions
• Leggett mode in a two-component Fermi gas with dipolar interactions