Abstract
Optical excitation of electron spin orientation and spin coherence is studied associated with the state-mixing due to the coupling of the anisotropic fine-structure and Zeeman energies. An adiabatically-induced magnetization is none of the consequence of either the angular-momentum transfer from light to matter or the Boltzmann population difference in the presence of magnetic field. Different types of the state-mixings are described with respect to the combination of the Zeeman sublevels. Experiment has been carried out for a sample of ruby at room temperature. Dependences of the intensity of the induced magnetization on wide ranges of the strength and direction of the magnetic field have shown excellent agreement with density-matrix calculation of the spin expectation values. Consideration of the spin state-mixing also accounts for the polarization-insensitive optical excitation of electron spin orientation previously reported for spin ensembles in poly-crystal and solution.
Published Version
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