Abstract
The mobility of surface electrons in quasi-one-dimensional conducting channels above liquid helium is studied experimentally at temperatures of 1.5–3K. It is found that for T>2K the mobility falls off sharply compared to the levels corresponding to kinetic mobility of the electrons. This behavior of the mobility can be explained by the formation of a self-localized electron state in the dense helium vapor accompanied by the appearance of a macroscopic region with a nonuniform distribution of the gas density surrounding an electron. Theoretical estimates of the temperature for formation of the self-localized state based on analyzing the conditions for a minimum free energy of the system are close to the experimental results.
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