Momentum distribution of a Fermi gas of atoms in the BCS-BEC crossover

Abstract

We observe dramatic changes in the atomic momentum distribution of a Fermi gas in the region of the BCS-BEC crossover. We study the shape of the momentum distribution and the kinetic energy as a function of interaction strength. The momentum distributions are compared to a mean-field crossover theory, and the kinetic energy is compared to theories for the two weakly interacting limits. The temperature dependence of the distribution is also presented.

arXiv commentIncludes revisions to Figure 3 and references

References in corpus (24)

• Observation of resonance condensation of fermionic atom pairs
• Condensation of Pairs of Fermionic Atoms Near a Feshbach Resonance
• Observation of a Strongly-Interacting Degenerate Fermi Gas of Atoms
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of the Pairing Gap in a Strongly Interacting Fermi Gas
• Experimental Study of the BEC-BCS Crossover Region in Lithium 6
• BCS-BEC Crossover: From High Temperature Superconductors to Ultracold Superfluids
• Evidence for Superfluidity in a Resonantly Interacting Fermi Gas
• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Probing many-body states of ultra-cold atoms via noise correlations
• Equation of state of a Fermi gas in the BEC-BCS crossover: a quantum Monte Carlo study
• Resonance superfluidity in a quantum degenerate Fermi gas
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Heat Capacity of a Strongly-Interacting Fermi Gas
• Prospect of creating a composite fermi/bose superfluid
• Tuning p-wave interactions in an ultracold Fermi gas of atoms
• Measurement of interaction energy near a Feshbach resonance in a 6Li Fermi gas
• Probing Pair-Correlated Fermionic Atoms through Correlations in Atom Shot Noise
• Measurement of positive and negative scattering lengths in a Fermi gas of atoms
• Probing the excitation spectrum of a Fermi gas in the BCS-BEC crossover regime
• Momentum distribution and condensate fraction of a Fermi gas in the BCS-BEC crossover
• Collective oscillations of an interacting trapped Fermi gas
• Momentum distribution of a trapped Fermi gas with large scattering length

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• Is an Ultra-Cold Strongly Interacting Fermi Gas a Perfect Fluid?
• Finite Temperature Momentum Distribution of a Trapped Fermi Gas
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