Seminar on Disorder and strong electron correlations
"Current rectification in ac-driven Hamiltonian systems:
From classical to quantum ratchets"
Starts 10 May 2012 12:30
Ends 10 May 2012 20:00
Central European Time
Leonardo da Vinci Building Luigi Stasi Seminar Room
Strada Costiera, 11
I - 34151 Trieste (Italy)
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.