The transition into resonating valence bond state in high frequency electromagnetic field

The influence of a high-frequency electromagnetic radiation on the parameters of the transition into the resonating valence bond state in the two-dimensional system with a strong local electronic repulsion is considered. The additions to the gap in the spinon's spectrum due to different mechanisms of field influence on the elementary collisions processes are obtained. It is shown, that the high phase transition temperature results in that the electron-phonon interactions play the main role in variations of the critical parameters under the radiation. Moreover, the stochastization due to phonon scattering can result both in increasing and decreasing the temperatures of phase transition. The conditions for the stimulation (suppression) of the transition by electromagnetic field are found