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VOLUME 81 | ISSUE 7 | PAGE 399
Damping effects and the metal-insulator transition in the two-dimensional electron gas
V. A. Khodel, M. V. Zverev, J. W. Clark*
Russian Research Centre «Kurchatov Institute", 123182 Moscow, Russia
*McDonnell Center for the Space Sciences and Department of Physics, Washington University, St. Louis, MO 63130, USA


PACS: 71.10.Hf, 71.27.+a
Abstract
The damping of single-particle degrees of freedom in strongly correlated two-dimensional Fermi systems is analyzed. Suppression of the scattering amplitude due to the damping effects is shown to play a key role in preserving the validity of the Landau-Migdal quasiparticle picture in a region of a phase transition, associated with the divergence of the quasiparticle effective mass. The results of the analysis are applied to elucidate the behavior of the conductivity σ(T) of the two-dimensional dilute electron gas in the density region where it undergoes a metal-insulator transition.


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