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Reentrant Insulator-Metal-Insulator Transition at<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">B</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>0</mml:mn><mml:mn /></mml:math>in a Two-Dimensional Hole Gas
We report the observation of a reentrant insulator-metal-insulator transition at $B\phantom{\rule{0ex}{0ex}}=\phantom{\rule{0ex}{0ex}}0$ in a two-dimensional (2D) hole gas in GaAs at temperatures down to 30 mK. At the lowest carrier densities the holes are strongly localized. As the carrier density is increased a metallic phase forms, with a clear transition at …