Abstract
Spectrum of the coupled electron–ripplon oscillations in the Wigner crystal over liquid helium with surface electron density 1.3×10 9 cm −2 in the temperature range 70–600 mK is studied. The experimental data of resonance width are shown not to be explained by capillary waves attenuation. The consideration is performed using both volume and surface hydrodynamics. A temperature dependence of mobility of the crystal is obtained. Influence of 3He impurities with concentration 0.25% on frequencies and width of the coupled electron–ripplon resonances is studied. It is found that the presence of the 3He impurity causes a noticeable widening of the resonances and decreases the resonant frequencies. The frequency decrease is explained to be due to the change in the surface tension of liquid.
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