Düsseldorf 2007 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 24: Quantengase (Bosonische Gitter II)

Q 24.2: Talk

Tuesday, March 20, 2007, 14:15–14:30, 6J

Dynamics of correlations and quantum phase transitions in bosonic lattice systems — •Oliver Buerschaper, Ignacio Cirac, and Michael Wolf — Max-Planck-Institute of Quantum Optics, Garching, Germany

We establish upper bounds on the propagation velocity of correlations in bosonic systems on arbitrary lattices for a wide class of interactions. It is shown that there exists an effective causal cone outside of which correlations between distant regions of the lattice are suppressed exponentially. Furthermore we discuss the implications of this result on the dynamics of quantum phase transitions in the Bose-Hubbard model.