Abstract
Magnetoplasmon waves of the nondegenerate two-dimensional electron system confined in a parabolic channel over liquid helium are studied in the ultra quantum limit (only the lowest spin-split Landau level is occupied) andstrong magnetic fields. It is shown that the dispersion relations and spatial structures have the characteristic scale l T = √2k B T/m*Ω 2 »l 0 , where Ω is the confinement frequency and l 0 is the magnetic length. We find a rich spectrum of low-frequency excited acoustical modes whose phase velocities exhibit anticrossings as a function of the metal gate distance d, for d «l T . It is shown that appearance of the anticrossings has essentially a quantum nature combined with the effect of the electron-electron interaction. In order to be able to discuss the conditions to detect the modes we determine the mode dissipation and compare our results with experimental data.
Published Version
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