(University of Geneva, Switzerland)

 

Tuesday, November 26th, 2024

1:30-3:00 PM

5-140D

 

Abstract: One of the goals of modern condensed matter is to design and control the behavior of quantum materials. The complexity of such many-body systems can be harnessed by engineering the couplings to external fields and environments. 

 In this talk, I will focus on two scenarios in which we take many-body systems out of equilibrium in order to probe, or control, their dynamics. In the first part, we investigate the full quantum evolution of ultracold interacting bosonic atoms on a chain coupled to an optical cavity, following a quench in the atoms-cavity coupling. We report the onset of periodic oscillations of the atomic coherences exhibiting hallmarks of synchronization, emerging from the interplay of the quantum dissipative nature of the cavity field and the presence of a (approximate) strong symmetry in the dissipative system. We devise a general recipe to engineer the dynamics of globally-interacting hybrid systems. 

In the second part, we investigate the Hall response of hardcore bosonic atoms on a triangular ladder in a magnetic field, making inroads in understanding the meaning of the Hall response for strongly interacting quantum phases, by analyzing the effects of frustration effects and phase transitions. We show that the nature of the underlying chiral phases have an important influence on the behavior of the Hall polarization, both in its saturation value and in the short-time dynamics. In particular, we find correlations between the features of the underlying phase diagram and the Hall response.

 

Everyone is welcome, light refreshments served.