Dresden 2026 – scientific programme
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O: Fachverband Oberflächenphysik
O 71: 2D Materials: Electronic structure, excitations, etc. – Poster (joint session O/TT)
O 71.18: Poster
Wednesday, March 11, 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 Rossnagel3,5, Ralf Schützhold1,6, 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