Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 35: Poster 2

Q 35.6: Poster

Wednesday, March 14, 2012, 16:30–19:00, Poster.I+II

Dynamics of Atoms in a Hamiltonian Quantum Ratchet — •Martin Leder, Tobias Burgermeister, Tobias Salger, Sebastian Kling, Christopher Grossert, and Martin Weitz — Institut für Angewandte Physik der Universität Bonn, Wegelerstr. 8, 53115 Bonn, Germany

Ratchets are devices that are able to generate a directed motion of particles in a fluctuating environment without any gradients or net forces. In order to observe the ratchet effect, one has to break the spatiotemporal symmetry of the system [1]. We have experimentally realized a Hamiltonian Quantum Ratchet [2]. Directed motion of a ⁸⁷Rb Bose-Einstein condensate is achieved by asymmetrically modulating the ampltitude of the ratchet potential.

Furthermore Absolute Negative Mobility (ANM), a counterintuitive motion against an external bias force, is presented. This effect has also been investigated with ac-driven systems in general.

[1] S. Denisov et al., Phys. Rev. A 75, 063424 (2007)

[2] T. Salger et al., Science 326, 1241 (2009)