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Fast interlayer exciton drift driven by lattice reconstruction in a van der Waals heterobilayer
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DOI：10.1038/s41563-026-02688-2.png)
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Abstract
En 中文
Modern short-scale information transmission mainly relies on dissipative charge transport, with electrons scattered by defects and phonons, leading to significant power losses. By contrast, excitons—charge-neutral quasiparticles—offer a playground for electro-optical energy-efficient information transduction and processing owing to their extended lifetimes, charge neutrality and efficient electrostatic control. In this work, we report the observation of fast exciton transport in a van der Waals heterostructure over distances exceeding 10 µm, constrained only by the heterostructure finite size. We observe the presence of excitonic potential ramps that leads to long-range rapid exciton drift and enables rapid dilution of the initial exciton population. Our measurements reveal fast exciton propagation, with interlayer exciton drift velocities of approximately 2.66 × 104 m s−1, within a transport regime that remains robust across a wide range of exciton densities and temperatures up to 150 K. Our work opens avenues for the development of high-speed, energy-efficient excitonic devices, such as field-effect switches and modulators. Time-resolved measurements of interlayer exciton transport in van der Waals heterobilayers show that lattice reconstruction generates potential energy gradients, driving rapid exciton drift towards low-energy recombination sites.
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