# Dresden 2020 – wissenschaftliches Programm

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# HL: Fachverband Halbleiterphysik

## HL 76: Poster IIIC

### HL 76.13: Poster

### Donnerstag, 19. März 2020, 15:00–17:30, P2/4OG

Universal short-time response and formation of correlations after quantum quenches — •Klaus Morawetz — Münster University of Applied Sciences, Stegerwaldstrasse 39, 48565 Steinfurt, Germany — International Institute of Physics- UFRN,Campus Universitário Lagoa nova,59078-970 Natal, Brazil

The short-time evolutions of two distinct systems, the pump and probe experiments with a semiconductor
and the sudden quench of cold atoms in an optical lattice, are found to be described by the same universal
response function. This analytic formula at short time scales is derived from the quantum kinetic-theory approach
observing that correlations need time to form. The demand of density conservation leads to a reduction of the
relaxation time by a factor of 4 in quench setups. The influence of the finite-trapping potential is derived and
discussed along with Singwi-Sjølander local-field corrections including the proof of sum rules. The quantum kinetic equation allows to understand how two-particle correlations are formed and how the screening and collective modes are build up.

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