Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 52: Ultracold atoms, ions and BEC V (with A)

Q 52.2: Talk

Thursday, March 20, 2014, 16:45–17:00, BEBEL SR140/142

Realizing non-hermicity with ultra-cold atoms and hermitian multi-well potentials — •Manuel Kreibich, Jörg Main, and Günter Wunner — Institut für Theoretische Physik 1, Universität Stuttgart, 70550 Stuttgart, Germany

We discuss the possibility of realizing a non-hermitian, i. e. an open two-well system of ultra-cold atoms by enclosing it with additional wells that serve as particle reservoirs. With the appropriate design of the additional wells almost arbitrary currents can be induced to and from the inner wells, including the important class of PT-symmetric currents, which support stable solutions.

We show that interaction in the mean-field limit does not destroy this property, it even allows for simple analytic expressions in the Thomas-Fermi limit. We finally discuss the implications of our results on the stability of atomic transport in optical lattices.