Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition

Abstract

We use laser light near resonant with an optical bound-to-bound transition to shift the magnetic field at which a Feshbach resonance occurs. We operate in a regime of large detuning and large laser intensity. This reduces the light-induced atom-loss rate by one order of magnitude compared to our previous experiments [D.M. Bauer et al. Nature Phys. 5, 339 (2009)]. The experiments are performed in an optical lattice and include high-resolution spectroscopy of excited molecular states, reported here. In addition, we give a detailed account of a theoretical model that describes our experimental data.

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• Center-of-mass-momentum-dependent interaction between ultracold atoms
• Universal Feature in Optical Control of a p-wave Feshbach Resonance
• Characterisation of three-body loss in ${}^{166}$Er and optimised production of large Bose-Einstein condensates
• Tuning a magnetic Feshbach resonance with spatially modulated laser light
• Radio-Frequency Manipulation of Fano-Feshbach Resonances in an Ultracold Fermi Gas of ${}^{40}$K
• Quantum Effects at Low Energy Atom-Molecule Interface