Controlling a magnetic Feshbach resonance with laser light

Details Controlling a magnetic Feshbach resonance with laser light Controlling a magnetic Feshbach resonance with laser light

2009-02-12

arxiv.org/abs/0902.2151v1

Nature Physics 5, 339-342 (2009).

Physics

Condensed Matter

Other Condensed Matter

Scientific paper

10.1038/NPHYS1232

The capability to tune the strength of the elastic interparticle interaction is crucial for many experiments with ultracold gases. Magnetic Feshbach resonances are a tool widely used for this purpose, but future experiments would benefit from additional flexibility such as spatial modulation of the interaction strength on short length scales. Optical Feshbach resonances offer this possibility in principle, but suffer from fast particle loss due to light-induced inelastic collisions. Here we show that light near-resonant with a molecular bound-to-bound transition can be used to shift the magnetic field at which a magnetic Feshbach resonance occurs. This makes it possible to tune the interaction strength with laser light and at the same time induce considerably less loss than an optical Feshbach resonance would do.

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