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Phys. Rev. B 64, 113202 (2001) [2 pages]

Deconstruction of the trap model for the new conducting state in two dimensions

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Philip Phillips
Loomis Laboratory of Physics, University of Illinois at Urbana-Champaign, 1100 West Green Street, Urbana, Illinois 61801-3080

Received 15 June 2000; published 31 August 2001

A key prediction of the trap model for the new conducting state in two dimensions is that the resistivity turns upwards below some characteristic temperature, Tmin. Altshuler, Maslov, and Pudalov [Phys. Status Solidi B 218, 193 (2000); Phys. Rev. Lett, 82, 145 (1999)] have argued that the reason why no upturn has been observed for the low density conducting samples is that the temperature was not low enough in the experiments. We show here that Tmin within the Altshuler, Maslov, and Pudalov trap model actually increases with decreasing density, contrary to their claim. Consequently, the trap model is not consistent with the experimental trends.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.64.113202
DOI:
10.1103/PhysRevB.64.113202
PACS:
71.30.+h, 73.40.Qv