Dresden 2026 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 71: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)

O 71.18: Poster

Mittwoch, 11. März 2026, 18:00–20:00, P2

Many-body localisation in the Fermi-Hubbard model? — •Ričards Kristers Knipšis¹, Jesumony Jayabalan², Gael Reecht², Vivek Mondal², Florian Konstantin Diekmann³, Friedemann Queisser¹, Ping Zhou², Walter Schnelle⁴, Kai Rossnagel^3,5, Ralf Schützhold^1,6, Manuel Gruber², and Uwe Bovensiepen² — ¹Helmholtz-Zentrum Dresden-Rossendorf, Dresden, Germany — ²Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — ³Institute of Experimental and Applied Physics, Christian-Albrechts-University of Kiel, Kiel, Germany — ⁴MPI for Chemical Physics of Solids, Dresden, Germany — ⁵Ruprecht-Haensel-Laboratory, DESY, Hamburg, Germany — ⁶Institute of Theoretical Physics, Dresden University of Technology, Dresden, Germany

Motivated by recent experimental results, we study the 2D Fermi-Hubbard model in the Mott insulator state under the influence of a disorder potential. Special emphasis is placed on signatures of many-body localisation.

Using the hierarchy of correlations, we find that the disorder potential can localise the effective quasi-particle wavefunctions, resulting in their spatial separation. This, in turn, can be used to explain the drastic increase in the quasi-particle lifetimes observed in experiment.

Funding by the DFG through the SFB 1242 is gratefully acknowledged.

Keywords: Strong correlations; Fermi-Hubbard model; Many-body localisation