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Dr. Dario Poletti

Université de Genève, Switzerland

Wednesday, April 11th, 2012 at 03:00:00 PM  

Conference room Querzoli - LENS - via Nello Carrara 1 - Sesto Fiorentino (Florence)

Published on-line at 04:50:44 PM on Wednesday, April 4th, 2012

Dynamics of strongly repulsive bosons in an optical lattice

Three very cold experiences from Innsbruck: cold atoms to study universal few-body physics, interspecies scattering properties and Erbium condensates.

Thanks to the high degree of control and tunability of the parameters in ultra-cold atoms experiments, it is now possible to study interesting physics of out-of-equilibrium quantum many-body systems.

Here, two different aspects of the dynamics of strongly interacting bosonic atoms in an optical lattice will be discussed. In the first part of the talk, by analyzing the quench dynamics of a one-dimensional bosonic Mott-insulator, it will be shown how quasi-particles pairs transport correlations with a finite velocity across the system. In particular, via experimental and numerical data and an analytical model, it will be shown that that this effective light-cone propagates at a speed which is dependent on the interaction.

The second part will be dedicated on how the interplay of dissipation and interactions affects the dynamics of a bosonic many-body quantum system. While both dissipation and strong interactions tend to suppress coherence when acting separately, strong interactions will be shown to impede the decoherence process generated by the dissipation.

Sorry, you are not able to play this video, but you can download it from here.

For further informations, please contact Prof. Giovanni Modugno.