Tunable Exciton Transport in Fully Hybridized van der Waals Trilayers.

Controlling exciton transport in van der Waals heterostructures opens new pathways for exploring quantum phenomena and advancing optoelectronic devices. Previous studies have primarily focused on bilayer structures, where exciton transport is governed by limited electronic hybridization between layers. Extending to trilayers promises greater freedom in tuning electronic hybridization and enabling richer exciton transport phenomena, yet this area remains largely unexplored. Here, we demonstrate tunable and robust exciton transport in fully hybridized WS_{2}/MoSe_{2}/WS_{2} trilayers. Unlike the monotonic behavior observed in bilayer systems, trilayers exhibit symmetry-driven exciton transport that can be modulated using external electric fields and remains stable up to 165 K. This distinctive transport mechanism originates from hybridization-driven transitions among different excitonic phases-quadrupolar, hybrid dipolar, and interlayer excitons. These transitions can also be triggered by adjusting the exciton density, resulting in abrupt changes in both transport characteristics and exciton lifetimes. Our findings provide essential insights into exciton transport mechanisms in multilayer heterostructures and highlight electronic hybridization as a key design principle for next-generation quantum optoelectronics.