title: Attosecond dynamical Franz-Keldysh effect in polycrystalline diamond.
abstract: 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.
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland. mlucchini@phys.ethz.ch.
authors: M
authors: M
authors: Lucchini
authors: Center for Computational Sciences, University of Tsukuba, 305-8577 Tsukuba, Japan.
authors: S A
authors: SA
authors: Sato
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors: A
authors: A
authors: Ludwig
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors: J
authors: J
authors: Herrmann
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors: M
authors: M
authors: Volkov
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors: L
authors: L
authors: Kasmi
authors: Photon Science Center, University of Tokyo, 113-8656 Tokyo, Japan.
authors: Y
authors: Y
authors: Shinohara
authors: Center for Computational Sciences, University of Tsukuba, 305-8577 Tsukuba, Japan.
authors: K
authors: K
authors: Yabana
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland. Institute of Applied Physics, University of Bern, 3012 Bern, Switzerland.
authors: L
authors: L
authors: Gallmann
authors: Department of Physics, ETH Zürich, 8093 Zürich, Switzerland.
authors: U
authors: U
authors: Keller