Inelastic light scattering tuned by correlated states in moiré superlattices

Moiré superlattices formed from twisted transition metal dichalcogenides (TMDCs) have been established as a promising platform to probe strongly correlated physics due to the presence of flat moiré minibands which generate strong Coulomb interactions. In addition, these systems can host significant lattice reconstruction and zone folding which can modify the phonon band structure. Here we report emergent inelastic scattering in dual-gated WS2/WSe2 heterobilayers. Below the melting temperature of the charge ordered states determined by reflection and photoluminescence measurements, we observe additional Raman peaks which are absent in the monolayer spectra. In addition to the strong temperature dependence, these features can be controlled through both doping and electric field. Our study highlights the delicate interplay between correlated electrons and lattice vibrations in moiré systems.