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The Metallic-Like Conductivity of a Two-Dimensional Hole System

Y. Hanein·U. Meirav·D. Shahar·C. C. Li·D. C. Tsui·Hadas Shtrikman
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Abstract

We report on a zero magnetic field transport study of a two-dimensional, variable-density, hole system in GaAs. As the density is varied we observe, for the first time in GaAs-based materials, a crossover from an insulating behavior at low-density, to a metallic-like behavior at high-density, where the metallic behavior is characterized by a large drop in the resistivity as the temperature is lowered. These results are in agreement with recent experiments on Si-based two-dimensional systems by Kravchenko et al. and others. We show that, in the metallic region, the resistivity is dominated by an exponential temperature-dependence with a characteristic temperature which is proportional to the hole density, and appear to reach a constant value at lower temperatures.

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Y. Hanein, U. Meirav, D. Shahar, C. C. Li, D. C. Tsui, Hadas Shtrikman. 1997-09-18. The Metallic-Like Conductivity of a Two-Dimensional Hole System. https://doi.org/10.1103/physrevlett.80.1288

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