Discovery of Two-Dimensional Electromagnetic Plasma Waves
A. Shuvaev, V. M. Muravev, P. A. Gusikhin, Jan Gospodarič, A. Pimenov, И. В. Кукушкин
Abstract
We report the experimental discovery of "superluminal" electromagnetic 2D plasma waves in the electromagnetic response of a high-quality GaAs/AlGaAs two-dimensional electron system on a dielectric substrate. We measure the plasma wave spectrum on samples with different electron density. It is established that, at large two-dimensional densities, there is a strong hybridization between the plasma and the Fabry-Perot light modes. In the presence of a perpendicular magnetic field, the plasma resonance is shown to split into two modes, each corresponding to a particular sense of circular polarization. Experimental results are found to be in good agreement with the theory.