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SYUA: Mesoscopic Physics of Ultracold Atoms

SYUA 1: Atom Chip Physics

SYUA 1.4: Hauptvortrag

Mittwoch, 9. März 2005, 12:30–13:00, HU Audimax

Atomic Quantum Dots in a Bose-Einstein-Condensate — •Wilhelm Zwerger — Institut für Theoretische Physik, Technikerstraße 25, 6020 Innsbruck, Austria

We discuss a possible realization of atomic quantum dots formed by single atoms in a tight optical trap which are coupled to a superfluid reservoir via laser transitions. Quantum interference between the collisional interactions and the laser induced coupling to the phase fluctuations of the condensate results in a tunable interaction of an effective two state system to a dissipative phonon bath. It allows to completely switch off the coupling to the environment. Embedding the trapped atoms in an atomic wire of cold bosonic atoms, a dissipative phase transition may be crossed beyond which Rabi oscillations entirely disappear.