Magneto-plasmon modes in a semiconductor under intense terahertz laser radiation

In this paper, we study theoretically how a linearly polarised intense laser field affects the magneto-plasmon modes in a semiconductor-based electron gas system. Using time-dependent condensed matter theory, we have obtained the electron density of states and the plasmon spectrum in the spectrum representation, and we have investigated the dependence of the magneto-plasmon excitation and the Fermi energy on frequency and intensity of the laser field and on magnetic field in GaAs material. The results are pertinent to the application of terahertz free-electron laser sources developed very recently.