Electron Correlation and Activated Hall Mobility
Experiments with inversion layers show clearly that the Hall mobility becomes activated at low temperatures when the carrier concentration is low. After a brief account of the inversion layer system, the observed behaviour of the Hall effect and the conductivity is described. Neither is consistent with independent particle mobility-edge and percolation models. It is shown that electron correlation must be important at low carrier densities, and the electron liquid model is described, according to which, when correlation is dominant, the carriers become localized in the Wigner and flow past the background disorder like a viscous liquid. It is suggested that correlation must always dominate sufficiently close to any metal-insulator transition so that activated Hall mobility should generally be observable in low carrier density systems at low temperatures.
KeywordsCarrier Concentration Hall Effect Hall Mobility Inversion Layer Percolation Model
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