Kardar-Parisi-Zhang universality in exciton-polaritons

by Anna Minguzzi

Laboratoire de Physique et Modelisation des Miliuex Condens├ęs, Universite Grenoble-Alpes and CNRS, Grenoble
at Physics Colloquium

Mon, 13 Jun 2022, 16:10
Zoom

Abstract

Revealing universal behaviors is a hallmark of statistical physics. Phenomena such as the stochastic growth of crystalline surfaces, of interfaces in bacterial colonies, and spin transport in quantum magnets all belong to the same universality class, despite the great plurality of physical mechanisms they involve at the microscopic level. This universality stems from a common underlying effective dynamics governed by the non-linear stochastic Kardar-Parisi-Zhang (KPZ) equation. Recent theoretical works suggest that this dynamics also emerges in the phase of exciton-polariton condensates, which are driven-dissipative out-of-equilibrium systems displaying macroscopic spontaneous coherence. I will present our joint theoretical-experimental works demonstrating the emergence of KPZ universality in such systems, inferred from space-time scaling of the first-order correlation function and the analysis of the probability distribution of phase fluctuations. Our results highlight the fundamental physical differences between out-of-equilibrium condensates and their equilibrium counterparts, and open a new paradigm for exploring universal behaviors in open systems.

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Created on 08-06-2022 by Kats, Yevgeny (katsye)
Updaded on 13-06-2022 by Kats, Yevgeny (katsye)