Non-local interactions and supersolidity of moir\'e excitons

TL;DR

This paper theoretically explores how non-local Coulomb interactions in moiré TMDC systems lead to exotic phases like supersolids and correlated insulators of excitons, which are tunable and observable at accessible temperatures.

Contribution

It introduces two moiré models and cluster mean-field theory to reveal supersolid and correlated insulating phases of excitons due to non-local interactions.

Findings

Existence of supersolid phases in moiré excitons

Correlated insulating states at accessible temperatures

Tunability via twist angle and exciton density

Abstract

Heterobilayer transition metal dichalcogenide (TMDC) moir\'e systems provide an ideal framework to investigate strongly correlated physics. Here we theoretically study bosonic many-body phases of excitons in moir\'e TMDCs. By using two moir\'e models and cluster mean-field theory, we reveal that, due to non-local Coulomb interactions, moir\'e excitons can feature exotic supersolid phases, i.e. superfluids of broken translational invariance, and correlated insulating states. The correlated phases exist at experimentally accessible temperatures and are tunable via the twist angle and exciton density.