Spin-dependent electron-radiation interaction is derived from the Foldy-Wouthuysen transformations of the Dirac equation. A spin magnetic moment term is identified both with spin-preserving and spin-flipping transitions and inspected for atoms and condensed matter specifically of GaAs on the basis of first-principles calculation. The connections to spin relaxation and spin-resolved photoemission are also presented.
Keywords: electro-optical spectra; photoemission; spin polarization; spin relaxation.
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