Letter abstract
Nature Physics 5, 339 - 342 (2009)
Published online: 6 April 2009 | doi:10.1038/nphys1232
Subject Categories: Atomic and molecular physics | Optical physics
Control of a magnetic Feshbach resonance with laser light
Dominik M. Bauer, Matthias Lettner, Christoph Vo, Gerhard Rempe & Stephan Dürr
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.
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Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Stra
e 1, 85748 Garching, Germany
Correspondence to: Stephan Dürr e-mail: stephan.duerr@mpq.mpg.de
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