Possible formation of autolocalized state of quasi-one-dimensional surface electrons in dense helium vapor
V.А. Nikolaenko, А.V. Smorodin, and S.S. Sokolov
B. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Ave., Kharkov 61103, Ukraine
Received June 3, 2010
The experimental study of surface electron mobility in quasi-one-dimensional conducting channels over
liquid helium is carried out in a temperature range of 1.5–3 K. It is found that the mobility decreases strongly, at T > 2 K, as compared to that in the kinetic regime
of electron conductivity. This behavior can be attributed to the formation of an autolocalized electron state in dense helium vapor that is accompanied by the
appearance of macroscopic regions with nonuniform distribution of vapor density. Theoretical estimation of
the temperature of autolocalized state formation based on the analysis of conditions for the occurrence of a free energy minimum in the system, gives the values close to the experimental ones.
PACS: 73.20.–r Electron states at surfaces and interfaces; PACS: 73.25.+i Surface conductivity and carrier phenomena; PACS: 73.90.+f Other topics in electronic structure and electrical properties of surfaces, interfaces, thin films, and low-dimensional structures.