Quantum Engineering at Nanokelvin Temperatures: Quantum Phase Transitions, Strong Correlations and Novel Many-body Systems
Professor Hanns-Christoph Nägerl
University of Innsbruck, Austria
11:00 am Tuesday, 20 July 2010, EN101
(Ground Floor, EN Building), Hawthorn.
I will review recent experiments with atomic and molecular quantum gases in the regime of quantum degeneracy, Bose-Einstein condensation, and strong correlations. Ultracold atomic and molecular gases are versatile tunable laboratory systems for the study of complex many-body quantum phenomena as essentially all parameters such as geometry and strength of confinement and the strength of interactions can be
controlled with near-perfect isolation from external perturbations. For atoms with 1D geometry, I will discuss the strongly-interacting limits of so-called Tonks-Girardeau and super-Tonks-Girardeau phases . We observe the “pinning” quantum phase transition in the presence of an arbitrarily weak lattice potential . I will briefly outline our efforts to achieve quantum degeneracy of molecules in optical lattice potentials  with the aim to generate dipolar quantum gas phases.
 Realization of an excited, strongly correlated quantum gas phase, E. Haller et al., Science 325, 1224 (2009).
 Pinning quantum phase transition for a Luttinger liquid of strongly interacting bosons, E. Haller et al., Nature in print, preprint at arXiv:1004.3168 (2010).
 An ultracold high-density sample of rovibronic ground-state molecules in an optical lattice, J.G. Danzl et al., Nature Physics 6, 265 (2010).
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