Bichromatic Moir\'e Superlattices for Tunable Quadrupolar Trions and Correlated States
Abstract
Moir\'e superlattices in transition metal dichalcogenide heterostructures provide a platform to engineer many-body interactions. Here, we realize a bichromatic moir\'e superlattice in an asymmetric WSe2/WS2/WSe2 heterotrilayer by combining R- and H-stacked bilayers with mismatched moir\'e wavelengths. This structure hosts fermionic quadrupolar moir\'e trions -- interlayer excitons bound to an opposite-layer hole -- with vanishing dipole moments. These trions arise from hybridized moir\'e potentials enabling multiple excitonic orbitals with tunable interlayer coupling, allowing control of excitonic and electronic ground states. We show that an out-of-plane electric field could effectively reshape moir\'e excitons and interlayer-intralayer electron correlations, driving a transition from interlayer to intralayer Mott states with enhanced Coulomb repulsion. The asymmetric stacking further enriches excitonic selection rules, broadening opportunities for spin-photon engineering. Our results demonstrate bichromatic moir\'e superlattices as a reconfigurable platform for emergent quantum states, where quadrupolar moir\'e trion emission may enable coherent and entangled quantum light manipulation.
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