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arXiv · 2603.15191

Velocity-tunable exciton-photon hybridization in cathodoluminescence

Sven Ebel·Martin Nørgaard·Christian Nicolaisen Hansen·N. Asger Mortensen·Sergii Morozov
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Abstract

Exciton-photon hybridization is typically realised in geometrically defined optical cavities, where tunability is achieved by modifying either the cavity or the excitonic medium. Here we investigate transition-radiation interferences in suspended subwavelength films resembling a free-electron-defined resonance and explore their interaction with excitons in transition metal dichalcogenides. We demonstrate that these resonances hybridize with excitonic transitions and can be tuned continuously by varying the electron energy. The resulting detuning depends on both film thickness and electron velocity, establishing the latter as an external and continuous knob for exciton-photon coupling. This approach enables tunable hybridization without structural modification and provides a free-electron-driven nanoscale platform for studying exciton-light interactions.

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Sven Ebel, Martin Nørgaard, Christian Nicolaisen Hansen, N. Asger Mortensen, Sergii Morozov. 2026-03-16. Velocity-tunable exciton-photon hybridization in cathodoluminescence. https://doi.org/10.1002/adfm.76737

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