Strongly correlated electrons in moire materials: an optical investigation

08.10.2024 13:00 – 14:30

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 doublon doped, the system exhibits ferromagnetic correlations in agreement with Nagaoka model. Our observations, which are supported by DMRG calculations, provide a direct evidence for magnetism with a kinetic origin.

Lieu

Bâtiment: Ecole de Physique

Auditoire Stuckelberg

entrée libre