Frankfurt 2006 – scientific programme

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Q: Quantenoptik und Photonik

Q 29: Poster Quanteneffekte

Q 29.8: Poster

Tuesday, March 14, 2006, 16:30–18:30, Labsaal

Hamiltonian Ratchets in Optical Lattices — •Sarah Kajari-Schröder and Eric Lutz — Abteilung Quantenphysik, Universität Ulm, 89069 Ulm

Thermal rachets, also called Brownian motors, show a directed current due to rectification of noise. In some systems chaotic dynamics can mimic the effects of thermal fluctuations. The emphasis of our work is the investigation of an experimental realisation of a chaotic Hamiltonian ratchet in a two-dimensional optical lattice. We present a way to achieve the necessary braking of the temporal and spatial symmetry and analyse the mechanisms leading to a directed current without a force or noise.