Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond.

نویسندگان

M Lucchini

S A Sato

A Ludwig

J Herrmann

M Volkov

L Kasmi

Y Shinohara

K Yabana

L Gallmann

U Keller

چکیده

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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