Semiconductor heterostructures in which the spin-orbit interaction is associated with the absence of a center of symmetry that limits the potential of the structure are the basis for future spintronics devices. One of the main methods for investigating into spin properties is the study of optical phenomena in magnetic fields. The article theoretically consider the effect of spin-orbit interaction on absorption in quantum wells, in particular, the intraband magnetic absorption of electromagnetic radiation of linear polarization by a two-dimensional electron gas with Rashba spin-orbit interaction. The coefficient of light absorption by free carriers in the quasi-two-dimensional system was calculated in the second order of perturbation theory. It is assumed that infrared electromagnetic radiation is absorbed in a quasi-two-dimensional system by free carriers, that are scattered by optical, piezoelectric, and acoustic lattice vibrations. The quantum-mechanical motion of an electron in a two-dimensional system in a constant uniform perpendicular magnetic field is described by the Hamiltonian taking into account the Rashba spin-orbit interaction and Zeeman splitting. We calculated the light absorption spectra of 2D electron gas for GaAs / In0.23Ga0.77As lattice structures.

Keywords: Rashba spin-orbit coupling, intraband magnetoabsorption, quasi-two-dimensional electron system, magnetic field, Landau levels, Zeeman splitting, wave functions