Probing Many-Body Localization and Floquet Thermalization in Bose-Hubbard Systems
October 7th, 2020 ANTONIO RUBIO ABADAL Max Planck Institute of Quantum Optics

Quantum gases of ultracold atoms display a high isolation from their environment. Over the last two decades, a range of experimental realizations have revived the discussion on how do isolated quantum systems reach thermal equilibrium. In particular, a focus of intense debate has been the search for possible exceptions to such ”quantum thermalization” processes. In this talk, I will describe experiments with ultracold bosonic atoms in optical lattices, in which we explore such questions. We do so by using a ”quantum-gas microscope”, which allows us to detect and control individual atoms with single-site resolution.

In the first part of the talk, I will discuss the dynamics of 2D out-of-equilibrium systems in the presence of tunneling, interactions and quenched disorder. By tracking the density distribution of certain initial states, we observe signatures of ”many-body localization”, a phenomenon that implies a breakdown of thermalization.

In a second part, I will show a recent study on the thermalization of a periodically driven system. While such systems typically heat up any initial state into a featureless one, this process may be postponed to extremely long times, enabling the creation of exotic long-lived prethermal states. In our experiment, we observe a dramatic reduction of the heating rates as we increase the drive frequency, consistent with an exponential-in-frequency suppression.


  • At ICFO Auditorium -> There’s limited capacity due the COVID restrictions. If you are interested in joining us at the Auditorium, please REGISTER HERE
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Wednesday, October 7, 12:00. 2020. ICFO Auditorium

Hosted by Prof Leticia Tarruell