Düsseldorf 2007 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 46: Quantengase (Wechselwirkungseffekte)

Q 46.4: Vortrag

Mittwoch, 21. März 2007, 17:15–17:30, 6J

Strongly correlated dipolar gases in optical lattices — •Giovanni Mazzarella, Arturo Argüelles, and Luis Santos — Insitiut für Theoretische Physik, Leibniz Universität Hannover

We analyze the physics of strongly correlated dipolar gases in optical lattices. We first discuss the case of spatially unconnected neighboring 1D systems, which are however interacting non-locally due to the dipolar interactions. We show, that the nonlocal interactions lead to a Mott-insulator-to-pair-superfluid transition that induces a significant modification of the Mott-insulator phases for low filling factors. We discuss the effects that this distortion may have on the spatial extension of the Mott-insulator plateaux in experiments with an harmonic confinement overimposed to the lattice potential, showing that anti-intuitively the Mott-insulator plateaux may become broader for increasing tunneling. We extend our analysis to nonlocally coupled 2D lattices by means of the corresponding mean-field calculations. In a second part, we study the conditions to achieve a significant collisionally-induced tunneling assisted by the dipole-dipole interaction. The effect of this new term in the Bose-Hubbard Hamiltonian, which resembles (but is not equivalent to) the so-called correlated-hopping in frustrated quantum magnets, are analyzed by means of a mean-field approach.