Strongly correlated electrons in a semiconductor moiré lattice system

Abstract

Moiré lattice systems of two-dimensional (2D) materials, which are superlattices based on the moiré interference of crystal lattices, have attracted much attention as a new platform for studying many-body physics of electrons and excitons. Transition metal dichalcogenides (TMDs), which are 2D semiconductor materials, are good candidates to host correlated electrons in moiré lattice due to their relatively heavy mass. While excitonic properties of TMDs have been extensively studied by optical measurements, electronic properties of moiré lattice systems have not been fully explored due to the difficulty of transport measurements. In this paper, I present our recent discovery of strongly correlated electronic states in semiconductor TMD moiré lattice systems by using exciton resonance in optical spectroscopy.