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DY: Fachverband Dynamik und Statistische Physik

DY 53: Poster: Quantum Dynamics, Chaos and Information; Many Body Systems

DY 53.17: Poster

Donnerstag, 19. März 2020, 15:00–18:00, P1A

Relaxation dynamics in a Hubbard dimer coupled to fermionic baths: phenomenological vs. microscopic description — •Eric Kleinherbers¹, Nikodem Szpak¹, Jürgen König¹, and Ralf Schützhold^2,3 — ¹Theoretische Physik, Universität Duisburg-Essen and CENIDE, Lotharstr. 1, 47048 Duisburg — ²Helmholtz-Zentrum Dresden-Rossendorf, Bautzner Landstraße 400, 01328 Dresden — ³Institut für Theoretische Physik, Technische Universität Dresden, 01062 Dresden

We study relaxation dynamics in a strongly-interacting two-site Fermi-Hubbard model that is induced by fermionic baths. On the one hand, we model the dynamics with a Lindblad equation where the jump operators are chosen on pure phenomenogical grounds in the spirit of a local-bath approximation. On the other hand, we employ the real-time diagrammtic technique and derive the generalized master equation microscopically. Analyzing the characteristic time scales of relaxation processes, we find and discuss qualitative differences between the phenomenological and the microscopic approach. [1]

[1] E. Kleinherbers, N. Szpak, J. König, and R. Schützhold, arXiv: 1910:04130 (2019)