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Giant multiphoton absorption in silicon

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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Correspondence to Nobuhiko Yokoshi or Hajime Ishihara.

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Fig. 1: Two-photon transitions in hydrogen systems.