By employing the exact time-dependent wavefunctions for an electron gas under a quantizing magnetic field and laser radiation, we study the dielectric properties of a system when the laser frequency equals the cyclotron frequency. This resonant condition leads to a new magneto-photon-plasmon (magnetopolariton) mode. Unlike the ordinary magnetoplasmon, the energy of the new mode increases linearly with the radiation intensity. As the wavenumber increases, this new mode behaves like a sound wave. The absorption due to the plasmon mode,Jfrm[1/epsi(q,w)], is presented.
Zhang, C., Pilehrood, S. and Lewis, R. A. (2005). Terahertz absorption by magnetoplasma sound wave excitation in semiconductor heterostructures. In A. Rakic and Y. Yeow (Eds.), Proceedings 2004 Conference on Optoelectronic and Microelectronic Materials and Devices (pp. 69-72). United States: IEEE.