Effect of Raman Process on the Nonadiabatic Dynamics of Electron-Phonon-Photon systems

We studied the wavepacket dynamics of coupled electron-phonon-photon systems by numerical calculations on the time-dependent Schrodinger equation. We take into account multiple photon modes in order to discuss the effect of Raman process. It has been shown that the conical intersection which appears on the potential energy surfaces plays an important role in photoexcitation/deexcitation dynamics. We consider that the wavelength of the photons is converted by the Raman process, and that it should be taken into account when both photons and phonons are coulpled with electrons. In the present paper, we discuss the effect of Raman process on the wavepacket motion by calculating the excited-state population, the wavepacket trajectories, and the entanglement entropy.