Hamburg 2009 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 51: Quantengase: Gitter und Tunneln II

Q 51.4: Vortrag

Donnerstag, 5. März 2009, 17:15–17:30, Audi-A

Ac-driven Atomic Quantum Motors — •Alexey Ponomarev, Sergey Denisov, and Peter Hänggi — Institute of Physics, University of Augsburg, Universitätstr. 1, D-86159 Augsburg

We consider ac-driven quantum motors consisting of two different, interacting ultracold atoms placed into a ring-shaped optical lattice which is submerged in a pulsating magnetic field. While the first atom carries a current, the second one serves as a quantum starter. For zero-momentum localized initial conditions, the amplitude of the generated dc-current saturates to the same non-zero value, independently on the initial phase lag of an external ac-field. This behavior distinctly differs from that predicted for dissipationless single-particle systems [1]. Also work against a load realized by an external biased potential has been investigated.

[1] S. Denisov, L. Morales-Molina, S. Flach, and P. Hänggi, Phys. Rev. A 75, 063424 (2007).