Local Sensing of Correlated Electrons in Dual-moir\'e Heterostructures using Dipolar Excitons

TL;DR

This paper demonstrates that localized dipolar excitons in dual-moiré heterostructures can serve as sensitive local probes to detect correlated electronic states and spin configurations, offering a new method for studying quantum phenomena in moiré materials.

Contribution

It introduces the use of dipolar excitons as local sensors for charge and spin in dual-moiré heterostructures, enabling high-resolution detection of correlated electronic phases.

Findings

Dipolar excitons detect correlated electronic states at fractional fillings.

Emission polarization reveals local electronic spin configurations.

Localized excitons serve as sensitive probes in moiré heterostructures.

Abstract

Moir\'e heterostructures are rapidly emerging as a tunable platform to study correlated electronic phenomena. Discovery of exotic quantum phases in moir\'e systems requires novel probes of charge and spin order. Unlike detection schemes which average over several moir\'e cells, local sensors can provide richer information with greater sensitivity. We study a WSe$_2$/MoSe$_2$/WSe$_2$ heterotrilayer which hosts excitons and electrons in distinct moir\'e lattices, and show that localized dipolar excitons are sensitive proximity charge sensors, uncovering numerous correlated electronic states at fractional fillings of the multi-orbital moir\'e lattice. In addition, the emission polarization can reveal the local electronic spin configuration at different fillings. Our results establish dipolar excitons as promising candidates to study emergent quantum matter and quantum magnetism in moir\'e crystals with higher spatial resolution.