Electrically tunable topological transport of moir\'e polaritons

TL;DR

This paper demonstrates electrically tunable topological transport phenomena in moiré polaritons, arising from the hybridization of interlayer excitons and cavity photons in 2D heterobilayers, enabling control over spin, valley, and polarization Hall effects.

Contribution

It introduces a novel platform of moiré polaritons with electrically tunable topological transport properties in 2D heterobilayer systems.

Findings

Observation of spin/valley Hall effects in moiré polaritons.

Electrical control of topological transport via exciton-cavity detuning.

Demonstration of polarization Hall effects in the system.

Abstract

Moir\'e interlayer exciton in transition metal dichalcogenide heterobilayer features a permanent electric dipole that enables the electrostatic control of its flow, and optical dipole that is spatially varying in the moir\'e landscape. We show the hybridization of moir\'e interlayer exciton with photons in a planar 2D cavity leads to two types of moir\'e polaritons that exhibit distinct forms of topological transport phenomena including the spin/valley Hall and polarization Hall effects, which feature remarkable electrical tunability through the control of exciton-cavity detuning by the interlayer bias.