An Apparent Minimum Metallic Conductivity in Two-Dimensional Systems

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Abstract
The low-temperature conductivity of low-density, high-mobility, two-dimensional hole systems in GaAs was studied. We explicitly show that the metal-insulator transition, observed in these systems, is characterized by a well-defined critical density, p0c, and by a minimum metallic conductivity with a value close to e^2/h. We also observe that the low-temperature conductivity of these systems depends linearly on the hole density, over a wide density range.

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