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Previous experimental work by M. Oberthaler's group in Heidelberg has led to the realization of Bosonic Josephson junctions with Bose-Einstein condensates in double-well potentials. When such systems are driven by means of a time-periodic modulation of their confinement, their many-body dynamics becomes quite involved, exhibiting typical features known from "quantum chaos". In fact, taking the often considered mean-field limit is similar to considering a classical nonlinear system, so that the study of "beyond mean field-effects" is closely related to that of the classical-quantum correspondence. These considerations become particularly pertinent when the modulation of the confining potential is not strictly periodic in time, but occurs with a slowly changing amplitude. In that case, a mixture of diabatic and non-adiabatic effects allows one to create certain target states with high efficiency, and to diagnose the complex many-body dynamics in terms of the final states-distribution reached after the modulation is turned off. This talk will give an overview over the essential mechanisms governing amplitude-controlled BEC-tunneling, with emphasis on the design of future experiments. |
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