MAGNETOPLASMONS IN SURFACE ELECTRON-SYSTE M OF HELIUM AT BORDER BETWEEN REGIONS WITH DIFFERENT CHARGE-DENSITY

Edge magnetoplasmons-like excitations between two regions having diffe rent densites of surface electrons on the superfluid helium were studi ed experimentally. Measurement was performed at the temperature 1.1 K and magnetic fields up to 0.2 T. The experimental results are in good agreement with the theoretically predicted linear dependences of borde r magnetoplasmon velocity vs density difference; the quality of magnet oplasmon resonanse is a nonlinear function of density difference.