On a charged particle's spin evolution induced by a strong laser

The quantum and classical dynamics of a charged, spin-1/2 particle interacting with a strong laser, modeled by the elliptically polarized monochromatic electromagnetic plane wave, is considered in the semi-classical approach. The charge interaction with a high intensity radiation is described classically without using of the dipole approximation. The particle's spin evolution is treated according to the Pauli equation with relativistic corrections caused by the laser intensity. The resonance character of transitions between spin-1/2 states for certain regimes of intensities and values of polarization is described. (paper)