Hybrid resonances in the optical absorption of a three-dimensional anisotropic quantum well

The optical absorption of electromagnetic radiation by an electron gas in a three-dimensional anisotropic quantum well subjected to a uniform magnetic field arbitrarily directed with respect to the potential symmetry axes is investigated. The dependence of the absorption coefficient on the radiation frequency, on the direction of the polarization vector, and on the magnitude and direction of the magnetic field is studied. It is shown that in the general case there are three resonance frequencies on the absorption curve; the amplitude and the position of the resonance peaks is investigated. In the limit $\overrightarrow{T}0$ (the case of a degenerate gas), the absorption curve as a function of the radiation frequency contains kinks.