Correlated insulating states in semiconductor moiré superlattices*

When two van der Waals materials of slightly different orientations or lattice constants are overlaid, a moiré pattern is formed. The moiré pattern introduces a new length scale, many times the lattice constant of the original materials, for Bragg scattering of Bloch electrons in each layer. This gives rise to moiré minibands and rich emergent phenomena. In this talk I will discuss recent experiments on transition metal dichalcogenide moiré systems, which exhibit a series of correlated insulating states from strong electronic correlation. We study the quantum phase diagram of the system by probing both the charge and magnetic response while continuously tuning the filling factor and other system parameters.