SKM 2023 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 61: Focus Session: Correlations in Moiré Quantum Matter II

TT 61.1: Vortrag

Donnerstag, 30. März 2023, 17:45–18:00, HSZ 201

Magnetism and metallicity in Moiré transition metal dichalcogenides — •Patrick Tscheppe¹, Jiawei Zang², Marcel Klett¹, Seher Karakuzu³, Thomas Maier⁴, Michel Ferrero^5,6, Andrew Millis^2,3, and Thomas Schäfer¹ — ¹Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, 70569 Stuttgart, Germany — ²Department of Physics, Columbia University, 538 West 120th Street, New York, New York 10027, USA — ³Center for Computational Quantum Physics, Flatiron Institute, 162 5th Avenue, New York, New York 10010, USA — ⁴Computational Sciences and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA — ⁵CPHT, CNRS, Ecole Polytechnique, Institut Polytechnique de Paris, Route de Saclay, 91128 Palaiseau, France — ⁶Collège de France, 11 place Marcelin Berthelot, 75005 Paris, France

The Moiré transition metal dichalcogenide homobilayer WSe₂ has recently been observed both to undergo continuous Mott transitions and to display quantum critical behavior, while also allowing for high tunability of its electronic parameters. At the same time, the effective low-energy physics of WSe₂ is believed to be adequately described by a simple one-band Hubbard model. We study the rich interplay between perfect nesting and dynamical as well as non-local correlations in this model using the cellular dynamical mean-field theory (CDMFT) in conjunction with the dynamical cluster approximation (DCA). In this way we elucidate the nature of both interaction and magnetic field-driven metal-insulator crossovers, previously observed in experiments.