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Q: Fachverband Quantenoptik und Photonik

Q 47: Quantengase: Gitter und Tunneln I

Q 47.1: Vortrag

Donnerstag, 5. März 2009, 14:00–14:15, Audi-A

Controlling a magnetic Feshbach resonance with laser light — •Matthias Lettner, Dominik M. Bauer, Christoph Vo, Gerhard Rempe, and Stephan Dürr — Max Planck-Institut für Quantenoptik, Hans Kopfermann Str.1, 85748 Garching

The capability to tune the strength of the elastic inter particle 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. For small detuning from the bound-to-bound transition we observe a splitting of the Feshbach resonance similar to an Autler-Townes doublet.