Author: ["Dominik M. Bauer","Matthias Lettner","Christoph Vo","Gerhard Rempe","Stephan Dürr"]
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Abstract
The strength of interparticle interactions in cold gases can be tuned using magnetic fields. This widely used approach is now combined with laser manipulation, providing additional flexibility, such as the possibility of spatially modulating the interaction strength on short length scales. The capability to tune the strength of the elastic interparticle interaction is crucial for many experiments with ultracold gases. Magnetic Feshbach resonances1,2 are widely harnessed for this purpose, but future experiments3,4,5,6,7,8 would benefit from extra flexibility, in particular from the capability to spatially modulate the interaction strength on short length scales. Optical Feshbach resonances9,10,11,12,13,14,15 do offer this possibility in principle, but in alkali atoms they induce rapid loss of particles due to light-induced inelastic collisions. Here, we report experiments that demonstrate that light near-resonant with a molecular bound-to-bound transition in 87Rb can be used to shift the magnetic field at which a magnetic Feshbach resonance occurs. This enables us to tune the interaction strength with laser light, but with considerably less loss than using an optical Feshbach resonance.Cite this article
Bauer, D., Lettner, M., Vo, C. et al. Control of a magnetic Feshbach resonance with laser light. Nature Phys 5, 339–342 (2009). https://doi.org/10.1038/nphys1232 