Optical control of Feshbach resonances in Fermi gases using molecular dark states

Abstract

We propose a general method for optical control of magnetic Feshbach resonances in ultracold atomic gases with more than one molecular state in an energetically closed channel. Using two optical frequencies to couple two states in the closed channel, inelastic loss arising from spontaneous emission is greatly suppressed by destructive quantum interference at the two-photon resonance, i.e., dark-state formation, while the scattering length is widely tunable by varying the frequencies and/or intensities of the optical fields. This technique is of particular interest for a two-component atomic Fermi gas, which is stable near a Feshbach resonance.

4 pages, 4 figures

References in corpus (7)

• Theory of ultracold Fermi gases
• Collective excitations of a degenerate gas at the BEC-BCS crossover
• Tuning the scattering length with an optically induced Feshbach resonance
• Molecular Probe of Pairing in the BEC-BCS Crossover
• Controlling a magnetic Feshbach resonance with laser light
• Large Amplitude Dynamics of the Pairing Correlations in a Unitary Fermi Gas
• Cross-Molecular Coupling in Combined Photoassociation and Feshbach Resonances

Cited by in corpus (34)

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