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Transition metal dichalcogenide (TMDC) moir\'e superlattices, owing to themoir\'e flatbands and strong correlation, can host periodic electron crystalsand fascinating correlated physics. The TMDC heterojunctions in the type-IIalignment also enable long-lived interlayer excitons that are promising forcorrelated bosonic states, while the interaction is dictated by the asymmetryof the heterojunction. Here we demonstrate a new excitonic state, quadrupolarexciton, in a symmetric WSe2-WS2-WSe2 trilayer moir\'e superlattice. Thequadrupolar excitons exhibit a quadratic dependence on the electric field,distinctively different from the linear Stark shift of the dipolar excitons inheterobilayers. This quadrupolar exciton stems from the hybridization of WSe2valence moir\'e flatbands. The same mechanism also gives rise to an interlayerMott insulator state, in which the two WSe2 layers share one hole laterallyconfined in one moir\'e unit cell. In contrast, the hole occupation probabilityin each layer can be continuously tuned via an out-of-plane electric field,reaching 100% in the top or bottom WSe2 under a large electric field,accompanying the transition from quadrupolar excitons to dipolar excitons. Ourwork demonstrates a trilayer moir\'e system as a new exciting playground forrealizing novel correlated states and engineering quantum phase transitions.

Quadrupolar Excitons and Hybridized Interlayer Mott Insulator in a Trilayer Moir\'e Superlattice