Regensburg 2010 – scientific programme

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TT: Fachverband Tiefe Temperaturen

TT 15: MLT: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 1

TT 15.8: Talk

Tuesday, March 23, 2010, 16:00–16:15, H18

ac-driven atomic quantum motor — •Sergey Denisov, Alexey V. Ponomarev, and Peter Hanggi — Institute of Physics, University of Augsburg, Germany

Our ac-driven quantum motor [1,2,3] consists of only two different, interacting ultracold atoms placed into a ring-shaped optical lattice. In this setup, while the first atom driven by an external magnetic field carries a current, the second one serves as a quantum starter. We demonstrate that (i) for zero-momentum initial conditions the asymptotic carrier velocity converges to a unique non-zero value, and (ii) the atomic quantum motor is able to perform a work against a constant load.

[1] A. V. Ponomarev, S. Denisov, and P. Hanggi, Phys. Rev. Lett. 102, 230601 (2009);

[2] A. V. Ponomarev, S. Denisov, and P. Hanggi, arXiv:0909.2813 (in press)

[3] Adrian Cho, feature in Science, web-link:
http://sciencenow.sciencemag.org/cgi/content/full/2009/609/1