Dressed Feshbach molecules in the BEC-BCS crossover

Abstract

We present the RPA theory of the BEC-BCS crossover in an atomic Fermi gas near a Feshbach resonance that includes the relevant two-body atomic physics exactly. This allows us to determine the probability $Z$ for the dressed molecules in the Bose-Einstein condensate to be in the closed channel of the Feshbach resonance and to compare with the recent experiments of Partridge {\it et al.} [cond-mat/0505353] with ${}^6$Li. We determine for this extremely broad resonance also the condensate density of the dressed molecules throughout the BEC-BCS crossover.

4 pages, 3 figures

References in corpus (7)

• Crossover from a molecular Bose-Einstein condensate to a degenerate Fermi gas
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Heat Capacity of a Strongly-Interacting Fermi Gas
• Equation of state and collective frequencies of a trapped Fermi gas along the BEC-unitarity crossover
• Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances
• Feshbach-Resonant Interactions in 40K and 6Li Degenerate Fermi Gases

Cited by in corpus (15)

• BCS-BEC Crossover and the Unitary Fermi Gas
• Universal Properties of the Ultra-Cold Fermi Gas
• Universal thermodynamics of strongly interacting Fermi gases
• Imbalanced Fermi Gases at Unitarity
• Pairing of a trapped resonantly-interacting fermion mixture with unequal spin populations
• Population and mass imbalance in atomic Fermi gases
• BEC-BCS crossover in an optical lattice
• Population of closed-channel molecules in trapped Fermi gases with broad Feshbach resonances
• Theory for p-Wave Feshbach Molecules
• Bogoliubov theory of Feshbach molecules in the BEC-BCS crossover
• Derivation of hydrodynamics for the gapless mode in the BEC-BCS crossover from the exact one-loop effective action
• Dressed-molecules in resonantly-interacting ultracold atomic Fermi gases
• Observation of the density dependence of the closed-channel fraction of a ${}^6$Li superfluid
• Mean-field stationary state of a Bose gas at a Feshbach resonance
• Fast mode of rotating atoms in one-dimensional lattice rings