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 garnered attention as a new platform for examining the many-body physics of electrons and excitons. Transition metal dichalcogenides (TMDs), which are 2D semiconductor materials, are considered as potential candidates for hosting correlated electrons in moiré lattices because of their relatively heavy mass. Although excitonic properties of TMDs have been extensively studied through optical measurements, the electronic properties of moiré lattice systems remain unexplored owing to the challenges of transport measurements. This study was focused on the recent discovery of strongly correlated electronic states in semiconductor TMD moiré lattice systems using exciton resonance in optical spectroscopy.