Dresden 2026 – scientific programme

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DY: Fachverband Dynamik und Statistische Physik

DY 38: Nonequilibrium Quantum Systems II (joint session TT/DY)

DY 38.1: Talk

Wednesday, March 11, 2026, 15:00–15:15, HSZ/0105

Nonlocal Correlation Effects in the Relaxation Dynamics of the Photo-Excited Hubbard Model — •Gusein Bedirkhanov¹, Nagamalleswararao Dasari², Alexander I. Lichtenstein², and Evgeny A. Stepanov¹ — ¹CPHT, CNRS, École polytechnique, Institut Polytechnique de Paris, 91120 Palaiseau, France — ²Institut für Theoretische Physik, Universität Hamburg, 22607 Hamburg, Germany

Experiments on ultrafast irradiation of correlated materials have revealed a variety of exotic nonequilibrium phenomena. A theoretical investigation of these phenomena requires methods capable of accurately describing a complex interplay between the non-perturbative local correlations and nonlocal collective electronic fluctuations throughout their relaxation pathway. A recently developed real-time nonequilibrium D-GW method allows for such a description by incorporating nonlocal charge and spin fluctuations diagrammatically, going beyond the dynamical mean-field theory solution. In this work, we apply D-GW to track the relaxation dynamics of a photo-excited Hubbard model across different interaction strengths, including the particularly challenging region near the Mott transition. To simulate the transfer of electronic energy to other degrees of freedom, we introduce controlled cooling by coupling the electronic system to various relaxation baths and compare their efficiency and physical implications. We analyze the emergent steady and metastable states, and investigate how interaction strength and nonlocal correlations shape the relaxation pathway.

Keywords: Photoinduced effects; Strongly correlated systems; Hubbard model; Dynamical mean-field theory; Diagrammatic methods