Università Cattolica del Sacro Cuore

Shaking Strongly Correlated Electrons

Seminario  22 gennaio 2018
Aula: Sala Riunioni -  Ore: 12.00
Via Musei 41, Brescia

Introduce:
Claudio GIANNETTI
Università Cattolica del Sacro Cuore

Interviene:
Marco SCHIRÒ
Institut de Physique Theorique of CEA-Saclay, France

Abstract:
We study the dynamics of the fermionic Hubbard model under a periodic modulation of the interaction around a finite positive value. Using nonequilibrium Dynamical Mean Field Theory we find, for moderate interactions, clear evidence of thermalization of local observables to a genuine infinite temperature state with no residual oscillations. Quite differently, in the strongly correlated Mott regime, the system remains trapped in a quasi-stationary state which is synchronized with the drive and extremely long-lived. The nature of this Floquet pre-thermal state dramatically changes upon tuning the drive frequency. In particular, we show the existence of critical frequency at which the system rapidly thermalize despite the strong interactions, an example of a dynamical transition with drive-assisted thermalization. Interestingly for drive frequencies above the critical one prethermalization emerges again, but the system effective thermalize to a negative temperature and a population inversion takes place. We provide the analytical understanding of these rich DMFT results using a Floquet Schrieffer-Wolff transformation.



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