Novel metallic behavior in two dimensions

Details Novel metallic behavior in two dimensions Novel metallic behavior in two dimensions

1999-03-15

arxiv.org/abs/cond-mat/9903236v3

Phys. Rev. Lett. 86, 2625 (2001)

Physics

Condensed Matter

4 pages, 4 figures, revtex; includes many more details

Scientific paper

10.1103/PhysRevLett.86.2625

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 (n_s-carrier density) to a non-zero 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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