Moir\'e-induced optical non-linearities: Single and multi-photon resonances

TL;DR

This paper investigates moiré excitons in a Bose-Hubbard model coupled to cavity photons, revealing complex phase behavior and the potential for multi-photon laser applications in strongly interacting light-matter systems.

Contribution

It introduces a detailed analysis of moiré exciton systems showing multi-photon resonances and bi-stability, advancing understanding of hybrid quantum phases in strongly interacting regimes.

Findings

Rich phase diagram with bi-stabilities due to multi-photon resonances

System can realize one- and multi-photon lasers

Strong inter-exciton interactions influence steady states

Abstract

Moir\'e excitons promise a new platform with which to generate and manipulate hybrid quantum phases of light and matter in unprecedented regimes of interaction strength. We explore the properties in this regime, through studies of a Bose-Hubbard model of excitons coupled to cavity photons. We show that the steady states exhibit a rich phase diagram with pronounced bi-stabilities governed by multi-photon resonances reflecting the strong inter-exciton interactions. In the presence of an incoherent pumping of excitons we find that the system can realise one- and multi-photon lasers.