Photon-energy-programmable subnanometric electron birth-site control

Abstract:Optical control of electron-generation sites has broadly enabled ultrafast nanoscale imaging, spectroscopy, and functional control. Existing approaches achieve nanoscale site selectivity by shaping localised optical fields around nanostructures, thereby limiting independent site selectivity within the same local-field hotspot. Here, using a single-molecule electron emitter, we show that site selectivity can instead be encoded in the electronic excitation pathway, enabling subnanometric control of electron birth sites within a common local-field hotspot. By tuning the photon energy, we selectively access different groups of molecular states whose combined contributions define emission channels with distinct spatial character, thereby reversibly switching the electron birth site within the same emitter. The switching is read out directly in the far-field emission pattern and occurs upon changing the photon energy, but not upon varying the intensity or polarisation. Our results establish optical birth-site selectivity that is not dictated by the local-field distribution, opening a route to electron birth-site control through the electronic excitation pathway.

Mesoscale and Nanoscale Physics (cond-mat.mes-hall); Quantum Physics (quant-ph)

arXiv:2605.28286 [cond-mat.mes-hall]

(or arXiv:2605.28286v2 [cond-mat.mes-hall] for this version)

https://doi.org/10.48550/arXiv.2605.28286 Focus to learn more arXiv-issued DOI via DataCite

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