Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 60: Quantengase (Gemische / Tunneleffekte)
Q 60.8: Vortrag
Freitag, 14. März 2008, 12:45–13:00, 3G/H
A coherent single atom shuttle between two Bose-Einstein condensates — •Uwe R. Fischer1, Christian Iniotakis2, and Anna Posazhennikova3 — 1Institut für Theoretische Physik, Universität Tübingen, Auf der Morgenstelle 14, D-72076 Tübingen, Germany — 2ETH Zürich, Institut für Theoretische Physik, CH-8093 Zürich, Switzerland — 3Physikalisches Institut, Universität Bonn, D-53115 Bonn, Germany
We study an atomic quantum dot representing a single hyperfine “impurity” atom which is coherently coupled to two well-separated Bose-Einstein condensates, in the limit when the coupling between the dot and the condensates dominates the inter-condensate tunneling coupling. It is demonstrated that the quantum dot by itself can induce coherent oscillations of the particle imbalance between the condensates, which display a two-frequency behavior. For noninteracting condensates, we provide an approximate solution to the coupled nonlinear equations of motion which allows us to obtain these two frequencies analytically.