First-principle real-time calculation for dynamical Franz-Keldysh effect under intense laser field

Otobe, Tomohito; Shinohara, Yasushi*; Sato, Shunsuke*; Yabana, Kazuhiro*

We calculate the dynamical Franz-Keldysh effect employing the time-dependent density-functional theory by solving time-dependent Kohn-Sham equation with real-time method for the first time. Our results reproduce previous theoretical and experimental result qualitatively. We also calculate the time evolution of the dielectric function in the intense mid-infrared laser. The modulation of the dielectric function is defined by the temporal intensity of the laser field and the adiabatic perspective is valid for intense laser field.