Comment on "Collective excitations of a degenerate gas at the BEC-BCS crossover"

Abstract

Very recent experiments have studied for the first time collective excitations of an ultracold ${}^6$Li gas covering in particular the BEC-BCS crossover domain. We point out that the results for the axial mode, through hydrodynamics, give direct access to the (3D) equation of state of the strongly interacting gas, mostly near the unitarity limit. On the other hand the surprising results found for the radial mode are actually not necessarily in contradiction with the expectations from superfluid hydrodynamics.

arXiv comment2 pages, 1 figure

References in corpus (5)

• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Superfluid Fermi Gases with Large Scattering Length
• Measurement of interaction energy near a Feshbach resonance in a 6Li Fermi gas
• Collective oscillations of a trapped Fermi gas near a Feshbach resonance
• Hydrodynamic modes of a 1D trapped Bose gas

Cited by in corpus (21)

• The BCS-BEC crossover: From ultra-cold Fermi gases to nuclear systems
• General relations for quantum gases in two and three dimensions. Two-component fermions
• Collective mode of homogeneous superfluid Fermi gases in the BEC-BCS crossover
• Number of closed-channel molecules in the BEC-BCS crossover
• Equation of state of a superfluid Fermi gas in the BCS-BEC crossover
• Bulk and Collective Properties of a Dilute Fermi Gas in the BCS-BEC Crossover
• Collective oscillations of a trapped Fermi gas near the unitary limit
• Equation of state and collective frequencies of a trapped Fermi gas along the BEC-unitarity crossover
• Nonlinear Schrödinger equation for a superfluid Fermi gas from BCS to Bose crossover
• Dynamics of a strongly interacting Fermi gas: the radial quadrupole mode
• Nonlinear Schroedinger equation for a superfluid Bose gas from weak coupling to unitarity: Study of vortices
• Sound velocity and multibranch Bogoliubov spectrum of an elongated Fermi superfluid in the BEC-BCS crossover
• Expansion of a Fermi Cloud in the BCS-BEC Crossover
• Local density approximation for a perturbative equation of state
• Collective Excitations of Strongly Interacting Fermi Gases of Atoms in a Harmonic Trap
• Fermi-Bose mixture across a Feshbach resonance
• Hydrodynamic Modes in a Trapped Strongly Interacting Fermi Gases of Atoms
• Radial quadrupole and scissors modes in trapped Fermi gases across the BCS phase transition
• Density response of a trapped Fermi gas: a crossover from the pair vibration mode to the Goldstone mode
• On the specific heat of a fermionic atomic cloud in the unitary regime
• Coupled oscillator model of a trapped Fermi gas at the BEC-BCS crossover