Abstract
We report preliminary measurements of high (ripplon-limited) electron mobility on helium films supported by a hydrogen-coated glass substrate. From the smooth dependence of the mobility as a function of helium film thickness we deduce that no polaron transition occurs on films thicker than 500 Å at T>1 K. On poorer quality substrates we observe a rapid drop in the mobility at a substrate-dependent critical film thickness. We interpret these drops as due to localization in variations in the substrate potential.
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Hu, X.L., Carmi, Y. & Dahm, A.J. Trapping of two-dimensional electrons in substrate potentials. J Low Temp Phys 89, 625–628 (1992). https://doi.org/10.1007/BF00694102
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DOI: https://doi.org/10.1007/BF00694102