The unique properties of two-dimensional moiré systems have been widely studied from many perspectives. However, relatively little work has investigated how the real-space structure of moiré systems can directly engender novel properties and functionalities. In this Letter, we explore how intriguing cooperative optical effects can emerge from the real-space superlattice formed by moiré excitons. Particularly, we show that the collective moiré exciton states can have either strongly enhanced (superradiant) or suppressed (subradiant) radiative decay rates, depending on their in-plane wave vector. These super- and subradiant states can be efficiently switched by a gate-induced electric field gradient. Moreover, the cooperative transmittance $T$ of the atomically thin moiré system can be switched from $T\approx 0$ (opaque) to $T\approx 1$ (transparent) with $\lesssim 1\%$ heterostrain or a 1° adjustment in the twist angle $\theta$. These features are robust against nonradiative losses and disorders, making the moiré system a highly versatile platform for cooperative quantum optics with potential applications in, e.g., single photon storage and switching.

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• Collective effects in quantum optics
• Excitons
• Light-matter interaction
• Quantum engineering
• Moire materials
• Transition metal trichalcogenides
• Twisted bilayers
• Green's function methods