Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 27: Quantengase: Optische Gitter 2
Q 27.3: Vortrag
Dienstag, 13. März 2012, 14:30–14:45, V53.01
Bosons with tunable interactions in optical lattices: Superfluid to Mott insulator transition and non-equilibrium dynamics — •Michael Schreiber1,2, Simon Braun1,2, Jens Philipp Ronzheimer1,2, Daniel Garbe1,2, Sean Hodgman1,2, Tim Rom1,2, Ulrich Schneider1,2, and Immanuel Bloch1,2 — 1LMU München — 2MPQ Garching
The Bose-Hubbard model is the most prominent model for the description of many-body states of bosons in optical lattices. Recently, the use of Feshbach resonances has made the full parameter space of this model accessible.
After preparing a Bose-Einstein condensate of 39K atoms in a red-detuned dipole trap, we superimpose a blue-detuned optical lattice. The independent control over these two potentials gives us access to the external confinement as well as the tunneling of the atoms. Utilizing a broad Feshbach resonance, we can additionally adjust the scattering length and thus control all parameters of the Bose-Hubbard model individually. Making use of this flexibility, we map out the superfluid to Mott insulator transition as a function of the interaction strength and tunneling. In addition we present our latest results on the dynamics of non-equilibrium states in this system.