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Area B

Research Area B: Control of quantum many-body systems by environments

 

In research area B a top-down approach is pursued. Here we will investigate what novel effects arise from the interplay and the competition between the unitary dynamics of an interacting many-body system and the coupling to reservoir(s) and/or time-periodic drives. In these complex systems typically not all degrees of freedom can be controlled precisely; the complexity leads, however, to new exciting collective phenomena, such as phase transitions.

Stationary states of open systems offer potential advantages such as robustness to perturbations and thus are of interest for the generation of exotic and otherwise fragile many-body states. In contrast to condensed matter systems, reservoir interactions in quantum optics can very often be considered as being Markovian, which allows for a better understanding of the underlying physics and thus offers large potential for their exploitation in reservoir engineering.

Projects:

B1: Weitz / Vewinger / /Kroha (BN)
Dynamics of an open photon BoseREinstein condensate system

B2: Ott / Fleischhauer (KL)
Dissipative dynamics of strongly interacting, optically driven Rydberg gases

B3: Kollath / Ott (BN/KL)
Ultra-cold quantum gases in spatially engineered dissipative environments

B4: Köhl / Kollath (BN)
Dynamical and dissipative control of ultra-cold atomic Fermi gases

B5: Widera (KL)
The BEC-BCS crossover in a gas doped with controlled impurities

 

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