Abstract
The low-temperature dc mobility of the two-dimensional electron system localized above the surface of superfluid helium is determined by the slowest stage of the longitudinal momentum transfer to the bulk liquid, namely, by the interaction between the surface and volume excitations of liquid helium, which decreases rapidly with the temperature. Thus, the temperature dependence of the low-frequency mobility is μdc ≈ 8.4 × 10−11 n e T −20/3 cm4 K20/3/(V s), where n e is the surface electron density. The relation T 20/3 E −3⊥ ≪ 2 × 10−7 between the pressing electric field (in kilovolts per centimeter) and temperature (in Kelvins) and the value ω ≲ 108 T 5 K−5 s−1 of the driving-field frequency have been obtained, at which the above effect can be observed. In particular, E ⊥ ≃ 1 kV/cm corresponds to T ≲ 70 mK and ω/2π ≲ 30 Hz.
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Original Russian Text © A.I. Safonov, I.I. Safonova, S.S. Demukh, 2010, published in Pis’ma v Zhurnal Éksperimental’noĭ i Teoreticheskoĭ Fiziki, 2010, Vol. 91, No. 8, pp. 431–435.
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Safonov, A.I., Safonova, I.I. & Demukh, S.S. Low-temperature mobility of surface electrons and ripplon-phonon interaction in liquid helium. Jetp Lett. 91, 398–401 (2010). https://doi.org/10.1134/S0021364010080072
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DOI: https://doi.org/10.1134/S0021364010080072