Localization and the Minimum Metallic Conductivity in Si Inversion Layers

Abstract
We observe the "minimum metallic conductivity," σm, to be a decreasing function of surface-state charge density, Qss, near the Si-SiO2 interface. This dependence of σm on Qss is contrary to Mott's concept of minimum metallic conductivity, but explains the large differences in σm reported in the recent literature.