Berlin 2014 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

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

Q 32.43: Poster

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

Out-of-equilibrium dynamics of bosons in optical lattices — •Henrik Lüschen1,2, Simon Braun1,2, Michael Schreiber1,2, Pranjal Bordia1,2, Frederik Görg1,2, Pau Gomez1,2, Sean Hodgman1,2, Immanuel Bloch1,2, and Ulrich Schneider1,21Max-Planck-Institut für Quantenoptik, Garching — 2Ludwig-Maximilians-Universität, München

Out-of-equilibrium dynamics of many-body systems, such as transport phenomena and thermalization, represent an active and challenging research field in strongly interacting systems. We use an ultracold bosonic gas in an optical lattice to study the out-of-equilibrium dynamics in the Bose-Hubbard model.

Specifically, we investigate the emergence of coherence when crossing the phase transition from the Mott insulating to the superfluid regime by studying the coherence length of the final state in 1D, 2D and 3D. We find a power-law increase with quench time and exponents that depend on the final interaction strength. These exponents differ significantly from the Kibble-Zurek prediction but are in good agreement with exact diagonalization calculations. We observe a strong symmetry in the emergence of coherence between positive and negative temperatures.

Additionally, we study the expansion dynamics of interacting bosons released into a homogeneous lattice. While the real space dynamics highlight the difference between ballistic and diffusive transport, the momentum space analysis reveals evidence of quasi-condensation of expanding hard-core bosons in 1D.

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