Bragg spectroscopy of a strongly interacting Fermi gas

Abstract

We present a comprehensive study of the Bose-Einstein condensate to Bardeen-Cooper-Schrieffer (BEC-BCS) crossover in fermionic ${}^6$Li using Bragg spectroscopy. A smooth transition from molecular to atomic spectra is observed with a clear signature of pairing at and above unitarity. These spectra probe the dynamic and static structure factors of the gas and provide a direct link to two-body correlations. We have characterised these correlations and measured their density dependence across the broad Feshbach resonance at 834 G.

Replaced with published version

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• 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
• Pairing and Phase Separation in a Polarized Fermi Gas
• Observation of Bose-Einstein Condensation of Molecules
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• Thermodynamics of the BCS-BEC crossover
• The Excitation Spectrum of a Bose-Einstein Condensate
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• Radio-Frequency Spectroscopy of Ultracold Fermions
• Three-body problem in Fermi gases with short-range interparticle interaction
• Momentum spectroscopy of 1D phase fluctuations in Bose-Einstein condensates
• Bragg spectroscopy of a strongly interacting 85Rb Bose-Einstein condensate
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• Universal thermodynamics of strongly interacting Fermi gases
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• Theory of coherent Bragg spectroscopy of a trapped Bose-Einstein condensate
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• Unitarity-Limited Elastic Collision Rate in a Harmonically-Trapped Fermi Gas
• Bragg Spectroscopy of Cold Atomic Fermi Gases
• Coherent Molecular Optics using Sodium Dimers
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