Berlin 2008 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 38: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ...

TT 38.8: Talk

Friday, February 29, 2008, 12:15–12:30, H 3010

Shuttle for cold atoms: atomic quantum dot inside Bose Josephson junction. — •Anna Posazhennikova¹, Uwe R. Fischer², and Christian Iniotakis³ — ¹Physikalisches Institut, Universitaet Bonn, Germany — ²Institut fuer Theoretische Physik, Eberhard-Karls-Universitate Tuebingen, Germany — ³ETH Zuerich, Institut fuer Theoretische Physik, Zuerich, Switzerland

We study an atomic quantum dot representing a single hyperfine ``impurity'' atom which is coherently coupled to two well-separated Bose-Einstein condensates. It is demonstrated that the quantum dot by itself can induce coherent oscillations of the particle imbalance between the condensates even when the conventional tunneling between the two condensates is exponentially small and can be completely neglected. In the limit of noninteracting condensates, we provide an analytical solution to the coupled nonlinear equations of motion which is in agreement with the full numerical treatment.