Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance

Abstract

We measure the effect of a magnetic Feshbach resonance (FR) on the rate and light-induced frequency shift of a photoassociation resonance in ultracold ${}^7$Li. The photoassociation-induced loss rate coefficient, $K_p$, depends strongly on magnetic field, varying by more than a factor of 10${}^4$ for fields near the FR. At sufficiently high laser intensities, $K_p$ for a thermal gas decreases with increasing intensity, while saturation is observed for the first time in a Bose-Einstein condensate. The frequency shift is also strongly field-dependent and exhibits an anomalous blue-shift for fields just below the FR.

4 pages, 4 figures. v2: updated comparison with theory; added references; added tick marks to Fig. 1 inset. To be published in Phys. Rev. Letters

References in corpus (6)

• Ultracold dense gas of deeply bound heteronuclear molecules
• Coherent optical transfer of Feshbach molecules to a lower vibrational state
• Phase Coherence and Superfluid-Insulator Transition in a Disordered Bose-Einstein Condensate
• Giant formation rates of ultracold molecules via Feshbach Optimized Photoassociation
• Cross-Molecular Coupling in Combined Photoassociation and Feshbach Resonances
• Two-body transients in coupled atomic-molecular BECs

Cited by in corpus (18)

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• Observation of the Sign Reversal of the Magnetic Correlation in a Driven-Dissipative Fermi Gas in Double Wells
• Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition
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• Stirring trapped atoms into fractional quantum Hall puddles
• Two-body recombination in a quantum mechanical lattice gas: Entropy generation and probing of short-range magnetic correlations
• Trimer superfluid and supersolid on two-dimensional optical lattices
• Trimer superfluid induced by photoassocation on the state-dependent optical lattice
• Resonant Manipulation of d-wave Interaction of Cold Atoms with Two Lasers and a Magnetic Field
• Radio-Frequency Manipulation of Fano-Feshbach Resonances in an Ultracold Fermi Gas of ${}^{40}$K
• Quantum Effects at Low Energy Atom-Molecule Interface
• Macroscopic Particle Transport in Dissipative Long-Range Bosonic Systems
• Collective dynamical Fermi suppression of optically-induced inelastic scattering
• Creating a Quantum Degenerate Gas of Stable Molecules via Weak Photoassociation
• Photoassociation spectroscopy of weakly bound ${}^{87}R{b}_2$ molecules near $5P_{1/2}+5S_{1/2}$ threshold by optical Bragg scattering in Bose-Einstein condensates