Abstract
The resonance spectrum of coupled electron–ripplon oscillations in two-dimensional electron crystals over liquid helium are investigated in the range of surface electron densities ns=(3.2–10.8)×108 cm−2 at holding electric fields E⊥=300–1150 V/cm, and in the temperature interval T=0.08–0.4 K. As a result of an analysis of the spectra, the real χ1 and imaginary χ2 parts of the inverse conductivity σ−1 of the crystals are obtained as functions of T, ns, and E⊥. The value found for χ2 is in good agreement with the theoretical estimates. Analysis of the dependences of χ1 suggests that the energy losses in the electron crystal are due to defects of its crystal structure.
Published Version
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