Greifswald 2024 – wissenschaftliches Programm

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K: Fachverband Kurzzeit- und angewandte Laserphysik

K 4: Poster

K 4.2: Poster

Montag, 26. Februar 2024, 16:30–18:30, ELP 6: Foyer

Two-particle self-consistent study of bi-layer Hubbard model under a static electric field — •Jiawei Yan — Department of Physics, University of Fribourg, 1700 Fribourg, Switzerland

We develop a nonequilibrium steady-state two-particle self-consistent method for Hubbard model. The theory respects the Mermin-Wagner theorem, incorporating non-local spatial fluctuations through a static vertex. By employing the Schwinger-Keldysh contour, we implement the method in real frequency. As an application, we investigate the magnetic behavior of a bi-layer Hubbard model under the influence of an electric field. We find a transition in the spin correlation between the layers, shifting from anti-ferromagnetism to ferromagnetism as the electric field intensity increases. This phenomenon is attributed to the inversion of the collective excitation spectrum within the spin channel.

Keywords: Hubbard model; two-particle self-consistency