The Influence of a Magnetic Field on Anomalous Electron Transport in a Quasi-Two-Dimensional Electron System over Liquid Helium

No Heading The magnetoresistance _xx in a quasi-two-dimensional electron system over liquid helium has been measured for magnetic fields up to 2 T in the temperature range 0.5 – 1.7 K. It has been shown that the behavior of the value of _xx as a function of a magnetic field B in the temperature region 1.2 – 1.7 K and at temperature T < 0.9 K is different. At high temperatures the negative magnetoresistance is observed due to weak localization of carriers, at T < 0.9 K the _xx increases monotonically under increasing B. It is supposed that such a difference in the behavior of the _xx is connected with the different character of the electron scattering: elastic at high temperatures, in the region of gas scattering, and inelastic at low temperatures. The last effect gives an additional evidence either for spatial ordering of electrons or for the formation of electron polarons in quasi-two- dimensional channels.PACS numbers: 73.20.Dx; 73.90.+f