Showing papers by "Chris J. Vale published in 2008"

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 6Li 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 characterized these correlations and measured their density dependence across the broad Feshbach resonance at 834 G.

Binding energies of L 6 i p -wave Feshbach molecules

Abstract: We present measurements of the binding energies of $^{6}\text{L}\text{i}$ $p$-wave Feshbach molecules formed in combinations of the $|F=1/2,{m}_{F}=+1/2⟩$ $(|1⟩)$ and $|F=1/2,{m}_{F}=\ensuremath{-}1/2⟩$ $(|2⟩)$ states. The binding energies scale linearly with magnetic field detuning for all three resonances. The relative molecular magnetic moments are found to be $113\ifmmode\pm\else\textpm\fi{}7\text{ }\ensuremath{\mu}\text{K}/\text{G}$, $111\ifmmode\pm\else\textpm\fi{}6\text{ }\ensuremath{\mu}\text{K}/\text{G}$, and $118\ifmmode\pm\else\textpm\fi{}8\text{ }\ensuremath{\mu}\text{K}/\text{G}$ for the $|1⟩\text{\ensuremath{-}}|1⟩$, $|1⟩\text{\ensuremath{-}}|2⟩$, and $|2⟩\text{\ensuremath{-}}|2⟩$ resonances, respectively, in good agreement with theoretical predictions. Closed-channel amplitudes and the size of the $p$-wave molecules are obtained theoretically from full closed-coupled calculations.