Superfluid density reduction and spin-imbalanced pairing in a fermionic superfluid due to dynamical boson exchange
arXiv:1805.04858 · doi:10.1103/PhysRevA.99.033620
Abstract
We explore novel features of a nonrelativistic fermionic superfluid in which the pairing interaction includes a contribution from the exchange of a dynamical bosonic mode. We show that the dynamical boson exchange (DBE), which causes a retarded pairing interaction and thus violates the Galilean invariance of the fermion sector, generically leads to a quantum reduction of the superfluid density and hence a nonzero normal fraction even at zero temperature. For spin-singlet pairing, the DBE also leads to a nonvanishing spin susceptibility at zero temperature, providing a mechanism for the coexistence of pairing and magnetization. While these effects are negligible for weak pairing, they become sizable at strong pairing. For the double superfluidity in ultracold Fermi-Bose mixtures, the superfluid density reduction for the fermion sector induced by the DBE just gives rise to the Andreev-Bashkin drag effect, indicating a strong entrainment between the two superfluid components. The DBE may also provide a new source for the superfluid fraction reduction of neutron matter, which is crucial for models of neutron star glitches based on neutron superfluidity.
V3: version published in Physical Review A, title changed
References in corpus (38)
- Many-Body Physics with Ultracold Gases
- Theory of ultracold Fermi gases
- Chiral effective field theory and nuclear forces
- Color superconductivity in dense quark matter
- Vortices and Superfluidity in a Strongly Interacting Fermi Gas
- Resonantly-paired fermionic superfluids
- Band geometry, Berry curvature and superfluid weight
- The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
- Neutron conduction in the inner crust of a neutron star in the framework of the band theory of solids
- Crustal Entrainment and Pulsar Glitches
- Tuning of heteronuclear interactions in a quantum-degenerate Fermi-Bose mixture
- Strongly enhanced tunneling at total charge neutrality in double bilayer graphene-WSe heterostructures
- Phase diagram of a cold polarized Fermi gas
- Mean field phase diagrams of imbalanced Fermi gases near a Feshbach resonance
- Two-species fermion mixtures with population imbalance
- A Unitary Fermi Supersolid: The Larkin-Ovchinnikov Phase
- Control of the interaction in a Fermi-Bose mixture
- Induced P-wave Superfluidity in Asymmetric Fermi Gases
- Two-Element Mixture of Bose and Fermi Superfluids
- Cooling and thermometry of atomic Fermi gases
- Pairing fluctuations and the superfluid density through the BCS-BEC crossover
- Surface Tension in Unitary Fermi Gases with Population Imbalance
- Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
- Observation of a Degenerate Fermi Gas Trapped by a Bose-Einstein Condensate
- High-Temperature Atomic Superfluidity in Lattice Boson-Fermion Mixtures
- Pairing and Superfluid Properties of Dilute Fermion Gases at Unitarity
- Engineering Superfluidity in Bose-Fermi Mixtures of Ultracold Atoms
- First and second sound in a strongly interacting Fermi gas
- Evidence from quantum Monte Carlo of large gap superfluidity and BCS-BEC crossover in double electron-hole layers
- Topological superfluid in a Fermi-Bose mixture with a high critical temperature
- Andreev-Bashkin effect in superfluid cold gases mixture
- BCS-BEC crossover in a random external potential
- p-Wave superfluid and phase separation in atomic Bose-Fermi mixture
- Strong coupling theory for the superfluidity of Bose-Fermi mixtures
- Fermion Cooper Pairing with Unequal Masses: Standard Field Theory Approach
- Low-temperature thermodynamics of the unitary Fermi gas: superfluid fraction, first sound and second sound
- Induced P-wave superfluidity within full energy-momentum dependent Eliashberg approximation in asymmetric dilute Fermi gases
- Color superconductivity and charge neutrality in Yukawa theory