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TT: Fachverband Tiefe Temperaturen
TT 10: Correlated Electrons: Other Theoretical Topics
TT 10.3: Talk
Monday, March 9, 2026, 11:30–11:45, HSZ/0103
Orbital Magnetic Field Driven Metal-Insulator Transition in Strongly Correlated Electron Systems — •Georg Rohringer1,2 and Anton Markov3 — 1Theory and Simulation of Condensed Matter, Department of Physics, King’s College London, The Strand, London WC2R 2LS, United Kingdom — 2I. Institute of Theoretical Physics, University of Hamburg, 20355 Hamburg, Germany — 3Center for Nonlinear Phenomena and Complex Systems, Université Libre de Bruxelles, CP 231, Campus Plaine, B-1050 Brussels, Belgium
We study the effects of an orbital magnetic field on the Mott metal-insulator transition in the Hubbard-Hofstadter model. We demonstrate that sufficiently large magnetic fields induce a Mott insulator-to-metal phase transition supporting our claim with dynamical mean field theory (DMFT) numerical results. For both competing phases (metal and insulator) we observe a magnetic-field-induced metallization reflected in an enhancement of kinetic and potential energy. We demonstrate that this phenomenon originates from a field-driven redistribution of spectral weight due to the formation of magnetic mini-bands and the Aharonov-Bohm effect experienced by electrons virtually tunneling around an elementary plaquette. Our theoretical results might be relevant for recent experimental studies on magnetic field driven insulator-to-metal transitions in strongly correlated materials such as VO2,λ-type organic conductors, and moiré multilayers.
Keywords: Mott insulators, magnetic fields