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TT: Fachverband Tiefe Temperaturen

TT 37: Correlated Electrons: Poster

TT 37.9: Poster

Mittwoch, 19. März 2025, 15:00–18:00, P4

Chiral Kondo Lattice Analyzed via Variational Cluster Approach — •Benjamin Heinrich and Maria Daghofer — Institute for Functional Matter and Quantum Technologies, University of Stuttgart, Germany

Moiré systems composed of van der Waals heterostructures provide an experimentally accessible platform to realize a wide range of strongly correlated electron phenomena. Using transition metal dichalcogenide materials, such as an AB-stacked MoTe₂/WSe₂ bilayer, gives rise to an effective multi-orbital Hubbard model on the honeycomb lattice, which can be tuned via doping and the introduction of charge transfer energy through external voltages. Including strong Ising spin-orbit coupling leads to chiral Kondo exchange between localized and itinerant electrons in different layers near half-filling.[1]

To gain a better understanding of experimentally observed phenomena, including magnetic ordering, numerical modeling is performed using the variational cluster approach. This methodology, closely related to cluster dynamical mean-field theory, has been proven effective for studying analogous systems exhibiting Kondo lattice behavior.

[1] Guerci et al., Sci. Adv. 9, eade7701 (2023).

Keywords: Moire; Kondo; Cluster Perturbation Theory; Van der Waals heterostructures; Variational Cluster Approach