Ultracold polarized Fermi gas at intermediate temperatures

Abstract

We consider non-zero temperature properties of the polarized two-component Fermi gas. We point out that stable polarized paired states which are more stable than their phase separated counterparts with unpolarized superfluid region can exist below the critical temperature. We also solve the system behavior in a trap using the local density approximation and find gradually increasing polarization in the center of the system as the temperature is increased. However, in the strongly interacting region the central polarization increases most rapidly close to the mean-field critical temperature, which is known to be substantially higher than the critical temperature for superfluidity. This indicates that most of the phase separation occurs in the fluctuation region prior to superfluidity and that the polarization in the actual superfluid is modest.

Final published version

References in corpus (5)

• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Asymmetric Fermi superfluid in a harmonic trap
• Boundary effect of deterministic dense coding

Cited by in corpus (8)

• Observation of Phase Separation in a Strongly-Interacting Imbalanced Fermi Gas
• BEC-BCS crossover, phase transitions and phase separation in polarized resonantly-paired superfluids
• Finite temperature phase diagram of a polarized Fermi gas in an optical lattice
• Effects of density imbalance on the BCS-BEC crossover in semiconductor electron-hole bilayers
• Mean field thermodynamics of a spin-polarized spherically trapped Fermi gas at unitarity
• Imbalanced Superfluid Phase of a Trapped Fermi Gas in the BCS-BEC Crossover Regime
• Noise correlations of the ultra-cold Fermi gas in an optical lattice
• Temperature Effects in a Fermi Gas with Population Imbalance