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Dr. Tommaso Macrì

Max Planck Institute for the Physics of Complex Systems, Dresden, Germany

Tuesday, April 30th, 2013 at 03:00:00 PM  

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

Published on-line at 09:00:29 AM on Wednesday, April 24th, 2013

Quantum phases and non equilibrium dynamics with Rydberg atoms

Experimental realization of exotic phases and investigation of non trivial quantum dynamics with ultracold atomic Rydberg gases.

Motivated by recent experimental efforts to realize exotic phases and study non trivial quantum dynamics with ultracold atomic Rydberg gases, I will discuss two examples from our recent work in the field.

Within the short (microsecond) coherence time of the system, optimized chirps allow the preparation of strongly interacting phases in a laser excited two-dimensional atomic Mott insulator, whose effective dynamics can be mapped to a long range Ising model with transverse and longitudinal fields. In particular I will prove the emergence of mesoscopic crystalline structures with a well-defined number of excitations via adiabatic sweeps of the laser parameters in finite two dimensional optical lattices.

In the second part I will discuss the properties of free space ground state atoms weakly dressed to the Rydberg state. I will focus on the crossover between the so called density wave supersolid and the defect-induced supersolid introduced by Andreev-Lifschitz and Chester by a complete analysis of the phase diagram at low densities. Finally I will show how these interesting exotic phases can be probed by looking at the excitation spectrum.

For further informations, please contact Dr. Augusto Smerzi.