The role of interactions in spin-polarised atomic Fermi gases at unitarity

Abstract

We study the zero temperature properties of a trapped polarized Fermi gas at unitarity by assuming phase separation between an unpolarized superfluid and a polarized normal phase. The effects of the interaction are accounted using the formalism of quasi-particles to build up the equation of state of the normal phase with the Monte Carlo results for the relevant parameters. Our predictions for the Chandrasekhar-Clogston limit of critical polarization and for the density profiles, including the density jump at the interface, are confirmed with excellent accuracy by the recent experimental results at MIT. The role of interaction on the radial width of the minority component, on the gap of the RF transition and on the spin oscillations in the normal phase is also discussed. Our analysis points out the Fermi liquid nature of these strongly interacting spin polarized configurations.

Revisitedc version accepted for pubblication. 1 figure added, 1 figure correted, typos corrected, references updated

References in corpus (15)

• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• Phase diagram of a two-component Fermi gas with resonant interactions
• Fermi-Polaron: Diagrammatic Monte Carlo for Divergent Sign-Alternating Series
• Normal state of a polarized Fermi gas at unitarity
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Pairing without Superfluidity: The Ground State of an Imbalanced Fermi Mixture
• Generic Phase Diagram of Fermion Superfluids with Population Imbalance
• Surface Tension in Unitary Fermi Gases with Population Imbalance
• Zero Temperature Thermodynamics of Asymmetric Fermi Gases at Unitarity
• Determination of the Equation of State of a Two-Component Fermi Gas at Unitarity
• Collisional Properties of a Polarized Fermi Gas with Resonant Interactions
• Phase diagram of a polarized Fermi gas across a Feshbach resonance in a potential trap
• Pair-Breaking in Rotating Fermi Gases
• Asymmetric Fermi superfluid in a harmonic trap
• Destroying superfluidity by rotating a Fermi gas at unitarity

Cited by in corpus (13)

• Ultra-cold Polarized Fermi Gases
• Phase structure of spin-imbalanced unitary Fermi gases
• Chandrasekhar-Clogston limit and critical polarization in a Fermi-Bose superfluid mixture
• Universality of the unitary Fermi gas: A few-body perspective
• Chandrasekhar-Clogston limit and phase separation in Fermi mixtures at Unitarity
• Exotic superfluid states of lattice fermions in elongated traps
• Finite-size and confinement effects in spin-polarized trapped Fermi gases
• Induced P-wave superfluidity within full energy-momentum dependent Eliashberg approximation in asymmetric dilute Fermi gases
• Density profiles of polarized Fermi gases confined in harmonic traps
• Normal-Superfluid Interface for Polarized Fermion Gases
• Unitary polarized Fermi gas under adiabatic rotation
• Pair condensation of polarized fermions in the BCS-BEC crossover
• Stochastic Dynamics and Bound States of Heavy Impurities in a Fermi Bath