Title: Photoinduced vibronic coupling in two-level dissipative systems,
Abstract: Interaction of an electron system with a strong electromagnetic wave leads to
rearrangement both the electron and vibrational energy spectra of a dissipative
system. For instance, the optically coupled electron levels become split in the
conditions of the ac Stark effect that gives rise to appearance of the
nonadiabatic coupling between the electron and vibrational motions. The
nonadiabatic coupling exerts a substantial impact on the electron and phonon
dynamics and must be taken into account to determine the system wave functions.
In this paper, the vibronic coupling induced by the ac Stark effect is
considered. It is shown that the interaction between the electron states
dressed by an electromagnetic field and the forced vibrations of reservoir
oscillators under the action of rapid changing of the electron density with the
Rabi frequency is responsible for establishment of the photoinduced vibronic
coupling. However, if the resonance conditions for the optical phonon frequency
and the transition frequency of electrons in the dressed state basis are
satisfied, the vibronic coupling is due to the electron-phonon interaction.
Additionally, photoinduced vibronic coupling results in appearance of the
doubly dressed states which are formed by both the electron-photon and
electron-vibrational interactions.