@misc{oai:repo.qst.go.jp:00066949, author = {乙部, 智仁 and 乙部 智仁}, month = {Oct}, note = {Density-functional calculations for the sub-cycle ultrafast dynamics in the dielectrics are presented. The calculations employing the time-dependent density functional theory (TDDFT) predicts the reversible change of the optical properties under an intense laser field, which can be attributed to the time-resolved dynamical Franz-Keldysh effect (DFKE). The time-resolved DFKE has been observed by the pump-probe experiment in attosecond timescale. An analytical formulation is also derived by parabolic two-band model. This model calculation well reproduces the computational and experimental results. From the computational and the analytical approaches, the polarization dependence of the DFKE can be also predicted., 9th AWCXR}, title = {Computational Approach for the Ultrafast Phenomena under Intense Laser fields}, year = {2018} }