Surface State Electrons on a Hydrogen Film. 2. Influence of Adsorbed Helium Films
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چکیده
We have investigated the conductivity of surface state electrons on liquid 4He films supported by a quench-condensed thin solid hydrogen substrate. A pronounced dip in the ac-conductivity was observed as the He film thickness reached about 10 layers. This phenomenon was studied at different temperatures (range between 1.6 and 210, electron densities from 0.9 to 19x10S cm -2, frequencies between 1 and IOOkHz, and for various amplitudes of the ac driving voltage. Ripplon scattering and a ripplonic polaron are discussed as sources for the conductivity dip.
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تاریخ انتشار 2004