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

Abstract

We study collective excitation modes of a fermionic gas of ${}^6$Li atoms in the BEC-BCS crossover regime. While measurements of the axial compression mode in the cigar-shaped trap close to a Feshbach resonance confirm theoretical expectations, the radial compression mode shows surprising features. In the strongly interacting molecular BEC regime we observe a negative frequency shift with increasing coupling strength. In the regime of a strongly interacting Fermi gas, an abrupt change in the collective excitation frequency occurs, which may be a signature for a transition from a superfluid to a collisionless phase.

arXiv commentFeshbach resonance position updated, few minor changes

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• Hydrodynamic Excitations of Trapped Fermi Gases
• Low energy Collective Modes of a Superfluid Trapped atomic Fermi Gas
• Low energy collective excitations in a superfluid trapped Fermi gas
• Feshbach resonance in dense ultracold Fermi gases
• Scissors mode in a superfluid Fermi gas
• Shrinking of a condensed fermionic cloud in a trap approaching the BEC limit

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• An Effective Series Expansion to the Equation of State of Unitary Fermi Gases
• Superfluid properties of an ultracold Fermi gas with an orbital Feshbach resonance in the BCS-BEC crossover region
• The normal state of attractive Fermi gases from coupled-cluster theory
• Decay of the Kohn mode in hydrodynamic regime
• Strong Coupling Effects on the Specific Heat of an Ultracold Fermi Gas in the Unitarity Limit
• Quantitative Probe of Pairing Correlations in a Cold Fermionic Atom Gas
• Anomalous isothermal compressibility in spin-orbit coupled degenerate Fermi gases
• Competitive algorithms for calculating the ground state properties of Bose-Fermi mixtures
• Quantum optics of ultra-cold molecules
• Spin susceptibility and effects of inhomogeneous strong pairing fluctuations in a trapped ultracold Fermi gas
• Superfluid hydrodynamics of polytropic gases:dimensional reduction and sound velocity
• Strong coupling effects on specific heat in the BCS-BEC crossover
• Small amplitude collective modes of a finite-size unitary Fermi gas in deformed traps
• Acoustic attenuation rate in the Fermi-Bose model with a finite-range fermion-fermion interaction
• Direct observation of Feshbach enhanced $s$-wave scattering of fermions
• Appropriate conditions to realize a $p$-wave superfluid state starting from a spin-orbit coupled $s$-wave superfluid Fermi gas
• Molecular regimes in ultracold Fermi gases
• Finite temperature effects in light scattering off Cooper-paired Fermi atoms