Optical control of a magnetic Feshbach resonance in ultracold Fermi gases

Abstract

We use laser light near-resonant with a molecular bound-to-bound transition to control a magnetic Feshbach resonance in ultracold Fermi gases of ${}^{40}$K atoms. The spectrum of excited molecular states is measured by applying a laser field that couples the ground Feshbach molecular state to electronically excited molecular states. Nine strong bound-to-bound resonances are observed below the ${}^2{P}_{1/2}{+}^2{S}_{1/2}$ threshold. We use radio-frequency spectroscopy to characterize the laser-dressed bound state near a specific bound-to-bound resonance and show clearly the shift of the magnetic Feshbach resonance using light with negligible atomic loss. The demonstrated technology could be used to modify interatomic interactions with high spatial and temporal resolutions in the crossover regime from a Bose-Einstein condensate (BEC) to a Bardeen-Cooper-Schrieffer (BCS) superfluid.

5 pages, 5 figures

References in corpus (8)

• Many-Body Physics with Ultracold Gases
• Theory of ultracold Fermi gases
• Vortices and Superfluidity in a Strongly Interacting Fermi Gas
• Observation of Bose-Einstein Condensation of Molecules
• Using photoemission spectroscopy to probe a strongly interacting Fermi gas
• Controlling a magnetic Feshbach resonance with laser light
• Photoassociation of a Bose-Einstein Condensate near a Feshbach Resonance
• Combination of a magnetic Feshbach resonance and an optical bound-to-bound transition

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