With the availability of high-intensity terahertz free-electron lasers, surprisingly large multiphoton absorptions in a phosphorus atom doped in a silicon crystal have been obtained, providing the possibility of a hydrogen-like system in silicon photonics and quantum information devices.
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Yokoshi, N., Ishihara, H. Giant multiphoton absorption in silicon. Nature Photon 12, 125–126 (2018). https://doi.org/10.1038/s41566-018-0119-2