Phase Diagram of a Strongly Interacting Spin-Imbalanced Fermi Gas

Abstract

We obtain the phase diagram of spin-imbalanced interacting Fermi gases from measurements of density profiles of ${}^6$Li atoms in a harmonic trap. These results agree with, and extend, previous experimental measurements. Measurements of the critical polarization at which the balanced superfluid core vanishes generally agree with previous experimental results and with quantum Monte Carlo (QMC) calculations in the BCS and unitary regimes. We disagree with the QMC results in the BEC regime, however, where the measured critical polarizations are greater than theoretically predicted. We also measure the equation of state in the crossover regime for a gas with equal numbers of the two fermion spin states.

7 pages, 5 figures

References in corpus (14)

• Theory of ultracold Fermi gases
• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• The Equation of State of a Low-Temperature Fermi Gas with Tunable Interactions
• Thermodynamics of the BCS-BEC crossover
• Deformation of a Trapped Fermi Gas with Unequal Spin Populations
• Normal state of a polarized Fermi gas at unitarity
• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
• Ultra-cold Polarized Fermi Gases
• Epsilon expansion for a Fermi gas at infinite scattering length
• Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
• Realization of a strongly interacting Bose-Fermi mixture from a two-component Fermi gas
• Thermodynamics of a trapped unitary Fermi gas
• Next-to-next-to-leading-order epsilon expansion for a Fermi gas at infinite scattering length
• Density profiles of polarized Fermi gases confined in harmonic traps

Cited by in corpus (23)

• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• 1D to 3D Crossover of a Spin-Imbalanced Fermi Gas
• Calorimetric Measurements of Magnetic-Field-Induced Inhomogeneous Superconductivity Above The Paramagnetic Limit
• Phase separation and pair condensation in a spin-imbalanced 2D Fermi gas
• The A-B transition in superfluid 3He under confinement in a thin slab geometry
• Finite-temperature equation of state of polarized fermions at unitarity
• Superfluid signatures in a dissipative quantum point contact
• Quantum Monte Carlo simulations of two-dimensional repulsive Fermi gases with population imbalance
• Disordered structures in ultracold spin-imbalanced Fermi gas
• Universal Properties of Fermi Gases in One-dimension
• Quantum Coherent States of Interacting Bose-Fermi Mixtures in One Dimension
• Evolution of an attractive polarized Fermi gas: From a Fermi liquid of polarons to a non-Fermi liquid at the Fulde-Ferrell-Larkin-Ovchinnikov quantum critical point
• Core filling and snaking instability of dark solitons in spin-imbalanced superfluid Fermi gases
• Application of renormalized RPA to polarized Fermi gases
• Spin-imbalanced ultracold Fermi gases in a two-dimensional array of tubes
• Transport of Spin and Mass at Normal-Superfluid Interfaces in the Unitary Fermi Gas
• Low-energy modes of spin-imbalanced Fermi gases in BCS phase
• Coexistence of topological and nontopological Fermi-superfluid phases
• Trapped imbalanced fermionic superfluids in one dimension: A variational approach
• Nonrelativistic fermions with holographic interactions and the unitary Fermi gas
• The normal state of attractive Fermi gases from coupled-cluster theory
• Vortex lattice in spin-imbalanced unitary Fermi gas
• Strong Fulde-Ferrell Larkin-Ovchinnikov pairing fluctuations in polarized Fermi systems