Magnetoplasmon-phonon coupling in aGaxIn1−xAs heterostructure

The coupling between magnetoplasmons and phonon modes in a ${\mathrm{Ga}}_{\mathrm{x}}$ ${\mathrm{In}}_{1\mathrm{-}\mathrm{x}}$As heterostructure is investigated theoretically. It is found that the magnetoplasmons of the quasi-two-dimensional electron gas strongly interact with two LO-phonon modes of the supporting lattice system. The frequencies of the coupled modes and their corresponding oscillator strengths are studied as a function of the wave vector, of the magnetic field strength, and of the electron density of the system. Based on our numerical results, it seems that the magnetoplasmon-phonon coupling will not result in a splitting of the cyclotron resonance mass at TO-phonon frequencies as suggested by R. J. Nicholas et al. [Phys. Rev. Lett. 55, 883 (1985)].