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

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

2011-10-04

arxiv.org/abs/1110.0650v1

PRL 108, 010401 (2012)

Physics

Condensed Matter

Quantum Gases

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.108.010401

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.

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