Influence of correlation effects on relaxation processes in a two-dimensional electron system on helium surface

Relaxation processes in a two-dimensional electron system are investigated without using the quasi-classical description under the conditions when the autocorrelation time τee, for the electron velocity is much shorter than the relaxation time of the system. A relation between the low-frequency conductivity and the energy loss rate of surface electrons, and the dynamic form factor of the two-dimensional electron liquid is established. It is shown that for the same values of the fundamental parameter Γ, equal to the ratio of the mean Coulomb energy to temperature, the contribution of correlation effects to the pulsed collision frequency increases with the electron concentration. The obtained theoretical results make it possible to explain the experimentally observed concentration dependence of the mobility of surface electrons and considerably broaden the region of applicability of the formulas describing energy relaxation.

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