Abstract:
The origin of the specific activation-type behavior of the mobility of electrons on liquid-helium films with different kinds of substrates is discussed. The characteristic feature of the activation energy $E_a$ observed in the experiment is its dependence on the effective film thickness $d$ in the form $E_a\propto d^{-2}$. A scenario of this effect is proposed with consideration for the roughness of the substrate underlying the liquid-helium film.
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