Journal
PHYSICAL REVIEW LETTERS
Volume 86, Issue 12, Pages 2625-2628Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.86.2625
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Experiments on a sufficiently disordered two-dimensional (2D) electron system in silicon reveal a new and unexpected kind of metallic behavior, where the conductivity decreases as sigma (n(s),T)= sigma (n(s),T = 0) + A(n(s))T-2 (where n(s) is carrier density) to a nonzero value as temperature T --> 0. In 2D, the existence of a metal with d sigma /dT > 0 is very surprising. In addition, a novel type of a metal-insulator transition obtains, which is unlike any known quantum phase transition in 2D.
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