Quantum quenches and restoration of symmetry

by Prof. Diptarka Das (Indian Institute of Technology)

Wednesday 22 Feb 2023, 13:00 → 14:00 Europe/Berlin

SR2

Abstract : We shall review some known universalities which are known to occur in out of equilibrium set ups and how effective thermal descriptions  emerge. We will find signatures of the effective temperature in scrambling behaviours of simple quantum systems. Next, we shall  consider smooth, global quantum quenches for two dimensional, massless interacting fermions with a large number of fermions. We find that the spontaneously broken symmetry (in equilibrium) gets restored via the smooth quench, which can be interpreted through thermalization. We identify the scaling of the symmetry restoration time with the Kibble-Zurek scaling in the problem. We end with comments on thermalization and generalizations.

 

Zoom link: https://desy.zoom.us/j/89221767711 Meeting ID: 892 2176 7711 Passcode: dstjc