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Low Density 2D-Electron Sheets on Liquid 3He Surface
(2006)
- In this work, experiments with electron mobility on the surface of 3He were carried out. Mobility measurements were done in the temperature range 0.6-600mK, the operating frequencies 1Hz-100kHz, the excitation voltage 4mV - 1V and pressing electrical fields 0-255V/cm on the top electrode and 0-47.5V/cm for three bottom electrodes. Films with different thicknesses 0.2, 0.5 and 1.0mm were also under investigations. In the temperature region above 300mK, electron scattering on 3He vapor atoms was observed. In our measurements we failed to observe Wigner solid crystallization. Possible explanations could be: Interplay of two conductivities, namely conductivity through the electron layer in the center ("bulk") and conductivity through the boundary layer of electrons ("boundary"). Another explanation could be overheating effect or sliding mode of Surface State Electrons, when electron layer was near decoupled from helium surface. In our opinion, it is most probable explanation. We also did measurements below temperature of the superfluid point transition, though we did not observed any change in the signal. Possible explanation could be overheating of electrons by excitation voltage or sliding mode.
