First-principle calculation for nonlinear response of dielectrics under an intense THz field

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

The electronic states in dielectrics are modulated by an intense THz light. One of the most illuminative phenomena is the dynamical Franz-Keldysh effect (DFKE). We calculate the DFKE with first peinciple method, time-dependent density functional theory. Our result shows that the change of the dielectric function has the peak before the peak of the light field.