Finite-Temperature Collective Dynamics of a Fermi Gas in the BEC-BCS Crossover

Abstract

We report on experimental studies on the collective behavior of a strongly interacting Fermi gas with tunable interactions and variable temperature. A scissors mode excitation in an elliptical trap is used to characterize the dynamics of the quantum gas in terms of hydrodynamic or near-collisionless behavior. We obtain a crossover phase diagram for collisional properties, showing a large region where a non-superfluid strongly interacting gas shows hydrodynamic behavior. In a narrow interaction regime on the BCS side of the crossover, we find a novel temperature-dependent damping peak, suggesting a relation to the superfluid phase transition.

References in corpus (5)

• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Precision Measurements of Collective Oscillations in the BEC-BCS Crossover
• The potential energy of a ${}^{40}$K Fermi gas in the BCS-BEC crossover
• Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode

Cited by in corpus (31)

• Theory of ultracold Fermi gases
• Thermodynamic Measurements in a Strongly Interacting Fermi Gas
• Two-Element Mixture of Bose and Fermi Superfluids
• Evidence of superfluidity in a dipolar supersolid from non-classical rotational inertia
• Rotating a supersolid dipolar gas
• Collective oscillations of a Fermi gas in the unitarity limit: Temperature effects and the role of pair correlations
• Universal Sound Diffusion in a Strongly Interacting Fermi Gas
• Particle-hole fluctuations in the BCS-BEC Crossover
• Collective Modes in a Unitary Fermi Gas across the Superfluid Phase Transition
• First and second sound in a strongly interacting Fermi gas
• Can angular oscillations probe superfluidity in dipolar supersolids?
• Breathing Mode of a BEC Repulsively Interacting with a Fermionic Reservoir
• Dimer-dimer collisions at finite energies in two-component Fermi gases
• Observation of interference between two molecular Bose-Einstein condensates
• Collective modes of trapped Fermi gases with in-medium interaction
• Moment of Inertia and Dynamical Rotational Response of a Supersolid Dipolar Gas
• Finite temperature damping of collective modes of a BCS-BEC crossover superfluid
• Pairing-gap, pseudo-gap, and no-gap phases in the radio-frequency spectra of a trapped unitary 6Li gas
• Numerical solution of the Boltzmann equation for trapped Fermi gases with in-medium effects
• Trap anharmonicity and sloshing mode of a Fermi gas
• Breathing Mode of a Bose-Einstein Condensate Immersed in a Fermi Sea
• Radial quadrupole and scissors modes in trapped Fermi gases across the BCS phase transition
• Low-momentum ring diagrams of neutron matter at and near the unitary limit
• Lifetime of angular momentum in a rotating strongly interacting Fermi gas
• Collective oscillations of a two-component Fermi gas on the repulsive branch
• Feshbach Resonances and Medium Effects in ultracold atomic Gases
• Spatial and Temporal Periodic Density Patterns in Driven Bose-Einstein Condensates
• Dipole-Mode Spectrum and Hydrodynamic Crossover in a Resonantly Interacting Two-Species Fermion Mixture
• Decay of the Kohn mode in hydrodynamic regime
• Small amplitude collective modes of a finite-size unitary Fermi gas in deformed traps
• Dynamical signatures of superfluidity and shear rigidity in different phases of a dipolar Bose-Einstein condensate