Scientific Calendar Event



Description
I will start with a short introduction into the ratchet problem by using a simple model of a particle in an ac-driven periodic potential, give a basic on the symmetry analysis, and discuss the  mechanisms of current rectification in the Hamiltonian limit.  Theoretical findings are illustrated with the experimental results obtained with cold atoms and optical potentials.  Next I will turn to  the quantum limit, specify quantum features of ac-driven Hamiltonian ratchets, and review the recent experimental realization of the quantum flashing/tilting ratchet with BEC of Rubidium atoms. Finally, the performance of quantum ratchets in the presence of decoherence will be addressed.
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