Electrically tunable inter-moiré coherence in dual-moiré superlattices

The moiré structure formed by precisely manipulating either twist angle or lattice mismatch between van der Waals atomic layers manifests exotic correlated phases and rich quantum phenomena. Although single-moiré systems have been extensively studied, the inter-moiré interactions involving multiple moiré interfaces remain elusive, limiting the reachable quantum phase space. Here we report the excitonic signatures of the tunable coherence and quantum interference between moiré interfaces using a coupled dual-moiré WSe₂/MoS₂/WSe₂ heterotrilayer. The device design controls the interference between interlayer electron transfer pathways, resulting in a coherent population trapping effect, which is sensitive to the symmetry between upper and lower moiré states. Moreover, such inter-moiré coherence can be tuned electrically, showing prominent electric-field-dependent oscillations in both interlayer exciton intensity and lifetime maps. Our results demonstrate the electrically tunable inter-moiré superposition of quantum states in coupled moiré superlattices, paving the way for the possibility of qubit operation in a scalable moiré-based quantum dot system.