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Séminaire QuantAlps : vendredi 5 mai 2023 à 11h00

Atac Imamoglu  (ETH Zürich)

Titre : Optical investigation of strong electronic correlations: magnetism in semiconductor moire materials


Institut Néel, Salle D420 (Nevill Mott)
Résumé : Moire superlattices in two dimensional semiconductors have enabled the observation of a wealth of phenomena driven by strong electronic correlations, ranging from Mott-Wigner states to quantum anomalous Hall effect. In this talk, I will describe magnetic properties of van der Waals heterostructures forming a frustrated triangular lattice in the vicinity of Mott-insulator states of electrons. By directly measuring electronic magnetization through the strength of the polarization-selective attractive polaron resonances, we find that when the Mott state is electron doped, the system exhibits ferromagnetic correlations in agreement with Nagaoka model. Our observations, which are in agreement with DMRG calculations, provide a direct evidence for itinerant magnetism with a kinetic origin..