ELECTRON MOBILITY ON THE SURFACE OF LIQUID HELIUM: INFLUENCE OF SURFACE LEVEL ATOMS AND DEPOPULATION OF LOWEST SUBBANDS
Grigoriev P.D., Dyugaev A.M., Lebedeva E.V.

Received: June 18, 2007

PACS: 73.20.-r, 68.03.-g, 73.40.-c, 67.90.+z, 68.03.Cd

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The temperature dependence of electron mobility is examined. We calculate the contribution to the electron scattering rate from the surface level atoms (SLA) proposed in [10]. This contribution is essential at low temperatures T<0.5, when the He vapor concentration is exponentially small. We also study the effect of depopulation of the lowest-energy subband, which leads to an increase in the electron mobility at high temperature. The results obtained explain some long-standing discrepancies between the existing theory and experiment on electron mobility on the surface of liquid helium.