Abstract
Coupled phonon-ripplon oscillations in a two-dimensional electron crystal over liquid helium with surface electron density n s =1.2×109 cm−2 at the temperature T=83 mK are studied in a Corbino experimental cell. The measurements are performed in the frequency interval where resonances of the coupled oscillations are observed and at different driving voltages V ∥ <10 mV at which nonlinear features in the crystal conductivity start to appear. A special attention is paid to a relatively narrow frequency interval ω/2π≃3–5 MHz. In this interval the jumps in the oscillation spectrum are observed. From the data obtained, the mobility and electron effective mass are calculated as functions of driving electric field. The electron effective mass in the crystal and dissipative losses are found to increase with the driving field increase. A possible reason for that can be an anharmonicity of the electron-ripplon interaction, which become noticeable if the electron crystal velocity along the surface is high enough.
Published Version
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