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TT: Fachverband Tiefe Temperaturen

TT 37: Matter At Low Temperature: Quantum Liquids, Bose-Einstein Condensates, Ultra-cold Atoms, ... 2

TT 37.3: Talk

Thursday, March 29, 2012, 10:00–10:15, H 3005

Interacting Bosonic Quantum Ratchets — •Karen Rodriguez and Achim Rosch — Institute for Theoretical Physics, University of Cologne, 50937 Cologne, Germany

We study the Hamiltonian quantum ratchet dynamics of cold Bosons loaded on optical lattices. Under the influence of time-periodic space-dependent hopping and local potential, the relevant symmetries are broken leading the system to develop unidirectional transport in long term evolutions. By means of the Floquet theory and the Gutwiller wave function, we analyze the transport problem and the crucial role of the interactions on the ratchet average dc-current.