Presentation Analytical theory for the transient absorption spectroscopy under circularly polarized laser

乙部, 智仁

2017-05-10
Description
An theoretically investigation is reported describing the dynamical Franz-Keldysh effect in femtosecond time resolution, that is, the time-dependent modulation of a dielectric function under an irradiation of an intense laser field. Two distinct approaches are developed for a pump-probe formalism : first-principles simulation based on real-time time-dependent density functional theory and analytic consideration of a simple two-band model. While time-average modulation may be reasonably described by the static Franz-Keldysh theory, a remarkable subcycle modulation and the phase shift is found to appear between the dielectric response and the applied electric field for linear polarization.In contrast, the subcycle modulation of the dielectric function, a significant feature of the time-resolved dynamical Franz-Keldysh effect (Tr-DFKE), disappears for circularly polarized laser .
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