Realization of condensed moiré exciton polaritons with tunable coherence in twisted photonic lattices at room temperature
Phys. Rev. B 113, 115308 – Published 16 March, 2026
DOI: https://doi.org/10.1103/q9l4-m8vb
Abstract
Moiré lattices attract significant attention in double-layer graphene and transition metal dichalcogenides (TMD) layer heterostructures as well as in photonic crystals due to the interesting exotic physics that emerges within these structures. In this work we report the strong coupling between excitons in microplates and moiré photonic modes at room temperature. Staggered moiré polariton states in different Bloch bands are directly measured. Increasing the pumping density, we observe moiré polariton condensation in the higher-energy bands. Importantly, with increasing the coupling strength between the twisted photonic lattices, we can tune the moiré polariton condensate from an insulating phase with short-range spatial coherence to a long-range spatial coherent state. The first-order coherence time is also increased by approximately 10%. Our work is generic for different moiré photonic lattices and lays the foundation to study coherent moiré polariton condensation at room temperature.
