Possible Metal/Insulator Transition at B=0 in Two Dimensions

Details Possible Metal/Insulator Transition at B=0 in Two Dimensions Possible Metal/Insulator Transition at B=0 in Two Dimensions

1994-05-26

arxiv.org/abs/cond-mat/9405082v1

Physics

Condensed Matter

10 pages; REVTeX v3.0; 3 POSTSCRIPT figures available upon request; to be published in PRB, Rapid Commun

Scientific paper

10.1103/PhysRevB.50.8039

We have studied the zero magnetic field resistivity of unique high- mobility two-dimensional electron system in silicon. At very low electron density (but higher than some sample-dependent critical value, $n_{cr}\sim 10^{11}$ cm$^{-2}$), CONVENTIONAL WEAK LOCALIZATION IS OVERPOWERED BY A SHARP DROP OF RESISTIVITY BY AN ORDER OF MAGNITUDE with decreasing temperature below 1--2 K. No further evidence for electron localization is seen down to at least 20 mK. For $n_s

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