Department of Physics, Ben-Gurion University, Beer
Sheva 84105, Israel
(Received 27 April 1999)
Asimple noninteracting-electron model, combining local
quantum tunneling and global classicalpercolation (due to a
finite dephasing time at low temperatures),is introduced to
describe a metal-insulator transition in two dimensions.It
is shown that many features of the experiments, suchas the
exponential dependence of the resistance on temperature inthe
metallic phase, the linear dependence of the exponent ondensity,
the e2/h scale of the critical resistance, the
quenching of the metallic phase by a parallel magnetic
field, and the nonmonotonic dependence of the critical
density on a perpendicular magnetic field, can be explained
by the model. ©1999 The American Physical Society
URL: http://mirror.publish.aps.org/abstract/prl/v83/p3506
PACS: 71.30.+h, 73.40.Qv, 73.50.Jt
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