X-ray photons emitted by free electrons travelling in van der Waals materials show energy shifts induced by quantum recoil, thus offering a viable route to generating tailored and tunable single X-ray photons.
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The author declares no competing interests.
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Talebi, N. Tunable quantum recoil. Nat. Photon. 17, 213–214 (2023). https://doi.org/10.1038/s41566-023-01155-7