Abstract
The results are presented of the experimental study of electron crystals over liquid helium with surface electron density of 3.2×10 8 and 6.4×10 8 cm −2 (melting temperatures 0.4 and 0.58 K) at temperature 83 mK and for holding electric fields 300–1200 V/cm. The measurements are performed in the frequency range 1–14 MHz where the coupled phonon–ripplon resonances are observed in the experimental cell. The real and imaginary parts of the complex conductivity of the crystal have been obtained as a result of analysis of an electron layer response on exciting ac voltage with frequency corresponding to the mode (0,1) of the coupled phonon–ripplon oscillations. An analysis of the results allows us to suppose that structural defects of the electron crystal play an essential role in dissipation processes.
Published Version
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