Dresden 2011 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 27: Ultra-cold atoms, ions and BEC III

Q 27.8: Talk

Wednesday, March 16, 2011, 12:30–12:45, BAR 106

Mixing and de-mixing of dressed condensates — •Eike Nicklas, Helmut Strobel, Christian Gross, Tilman Zibold, Jiri Tomkovic, and Markus K Oberthaler — Kirchhoff Institute for Physics, University of Heidelberg, Germany

Two component interacting Bose-Einstein condensates provide a versatile system for studying the dynamics of multicomponent quantum fluids. Here we report on a method for controlling the effective interactions that govern the miscibility of the system by dressing the two components with a linear coupling field. We experimentally investigate the demixing dynamics of a binary condensate consisting of two hyperfine states of Rubidium and compare the results with numerical simulations. A Feshbach resonance allows changing the miscibility parameter of the system. We observe suppression of demixing when the two components are dressed with a linear coupling and the effective miscibility can be controlled via the coupling strength. Furthermore, we find that a miscible system is destabilized when applying a driving field.