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Weak-localization-like temperature-dependent conductivity of a dilute two-dimensional hole gas in a parallel magnetic
Xuan P A Gao1, Allen P Mills, Arthur P Ramirez
1Department of Applied Physics & Applied Math, Columbia University, New York City, New York 10027, USA.
Abstract:
We have studied the magnetotransport properties of a high mobility two-dimensional hole gas (2DHG) in a 10 nm GaAs quantum well with densities in the range of (0.7-1.6) x 10(10) cm(-2) on the metallic side of the zero-field "metal-insulator transition." In a parallel field well above B(c) that suppresses the metallic conductivity, the 2DHG exhibits a conductivity Delta(g)(T) approximately (1/pi) (e(2)/h)lnT reminiscent of weak localization for Fermi liquids. The experiments are consistent with the coexistence of two phases in our system: a metallic phase and a weakly insulating Fermi liquid phase.