Optical investigation of strongly correlated electrons
Atac Imamoglu, ETH Zurich
Two dimensional semiconductors subject to a Moiré potential
provide a fertile ground for exploration of strongly correlated phases,
ranging from kinetic magnetism, through fractional Chern insulators to
unconventional superconductivity. In the first set of experiments , we
studied topologically trivial moire bands with vanishing exchange
interactions; here we observed ferromagnetic correlations stemming from
a kinetic mechanism. The focus of the second set of experiments was on
interplay between interactions and topology in twisted MoTe2
homobilayer. In this system, we demonstrated optical control of
ferromagnetism in general and topological Chern insulator states in
particular.