Abstract
Interaction of an electron system with a strong electromagnetic wave leads to rearrangement of 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 states. In this paper, the mechanism of energy transfer between the electron system and the phonon reservoir is presented. This mechanism is based on establishment of the coupling between the electron states dressed by the electromagnetic field and the vibrations of reservoir oscillators. In the most general case, the photoinduced vibronic coupling is established by the interaction of electrons with the forced vibrations of reservoir oscillators under the action of rapid changing of the electron density with the Rabi frequency. 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. The photoinduced vibronic coupling results in the appearance of the states that are doubly dressed by interaction, the first time due to the electron–photon interaction, and the second time due to the electron–vibrational interaction. Moreover, this coupling opens the way to control energy that can be transferred to (heating) or removed from (cooling) the phonon reservoir depending on the parameters of the electromagnetic pulse.
© 2017 Optical Society of America
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