The Metalliclike Conductivity of a Two-Dimensional Hole System
The Metalliclike Conductivity of a Two-Dimensional Hole System
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 …