Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 32: Poster: Quantum gases, ultracold atoms and molecules

Q 32.37: Poster

Mittwoch, 19. März 2014, 16:30–18:30, Spree-Palais

Dissipation through localised loss in bosonic systems with long-range interactions — •Ivana Vidanovic, Daniel Cocks, and Walter Hofstetter — Institut für Theoretische Physik, Johann Wolfgang Goethe-Universität, Frankfurt am Main Germany

In the recent years, controlled dissipation has proven to be a useful tool for probing of a quantum system in the ultracold setup. In this paper we consider dynamics of bosons induced by a dissipative local defect. We address superfluid and supersolid phases that are ground states of an extended Bose-Hubbard Hamiltonian. To this end, we solve the master equation using the Gutzwiller approximation and find that in the usual homogeneous superfluid phase repulsive interactions lead to enhanced dissipation process. On the other hand, our mean-field ap- proach indicates that the effective loss rates are significantly suppressed deep in the supersolid phase where repulsive nearest neighbour interac- tions play a dominant role. Our numerical results are explained by an analytical insight and in particular, in the limit of strong dissipation we recover the quantum Zeno effect.