Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond

Lucchini, M.; Sato, S. A.; Ludwig, A.; Herrmann, J.; Volkov, M.; Kasmi, L.; Shinohara, Y.; Yabana, K.; Gallmann, Lukas; Keller, U. (2016). Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond. Science, 353(6302), pp. 916-919. American Association for the Advancement of Science 10.1126/science.aag1268

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Short, intense laser pulses can be used to access the transition regime between classical and quantum optical responses in dielectrics. In this regime, the relative roles of inter- and intraband light-driven electronic transitions remain uncertain. We applied attosecond transient absorption spectroscopy to investigate the interaction between polycrystalline diamond and a few-femtosecond infrared pulse with intensity below the critical intensity of optical breakdown. Ab initio time-dependent density functional theory calculations, in tandem with a two-band parabolic model, accounted for the experimental results in the framework of the dynamical Franz-Keldysh effect and identified infrared induction of intraband currents as the main physical mechanism responsible for the observations.

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