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    Giant multiphoton absorption for THz resonances in silicon hydrogenic donors

    The absorption of multiple photons when there is no resonant intermediate state is a well-known nonlinear process in atomic vapours, dyes and semiconductors. The N-photon absorption (NPA) rate for donors in semic...

    M. A. W. van Loon, N. Stavrias, Nguyen H. Le, K. L. Litvinenko in Nature Photonics (2018)