Abstract
The response of a sheet of electrons on the surface of liquid helium to an ac driving field parallel to the surface is investigated. A Corbino-type electrode arrangement is used to study the influence of a vertical magnetic field. The surface electron mobility is deduced from the observed temperature and magnetic field dependences of the ac response, by means of a simplified equivalent circuit analysis. The mobility data thus obtained show the ripplon-limited behavior at low temperature and are in reasonable agreement with the previous experimental result of Grimes and Adams and with the theoretical calculation of Saitoh. A similar measurement carried out on the surface of 3He has revealed that the mobility is determined by the gas atom scattering down to the lowest temperature (~ 0.5 K) of the present study.
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