The metallic resistance of a dilute two-dimensional hole gas in a GaAs quantum well: two-phase separation at finite temperature?

Abstract

We have studied the magnetotransport properties of a high mobility two-dimensional hole gas (2DHG) system in a 10nm GaAs quantum well (QW) with densities in range of 0.7-1.6*10^10 cm^-2 on the metallic side of the zero-field 'metal-insulator transition' (MIT). In a parallel field well above B_c that suppresses the metallic conductivity, the 2DHG exhibits a conductivity g(T)~0.3(e^2/h)lnT reminiscent of weak localization. The experiments are consistent with the coexistence of two phases in our system: a metallic phase and a weakly insulating Fermi liquid phase having a percolation threshold close to B_c.

References in corpus (3)

• Spin polarization and g-factor of a dilute GaAs two-dimensional electron system
• Fermi-liquid behaviour of the low-density 2D hole gas in GaAs/AlGaAs heterostructure at large values of r_s
• Two-dimensional metal in a parallel magnetic field

Cited by in corpus (19)

• Metal-insulator transition in two-dimensional electron systems
• Spin-independent origin of the strongly enhanced effective mass in a dilute 2D electron system
• Metal-insulator transitions and the effects of electron-electron interactions in two-dimensional electron systems
• The so-called two dimensional metal-insulator transition
• Spin polarization and metallic behavior of a silicon two-dimensional electron system
• Resistance Noise Scaling in a Dilute Two-Dimensional Hole System in GaAs
• Strongly Enhanced Hole-Phonon Coupling in the Metallic State of the Dilute Two-Dimensional Hole Gas
• Connecting the Reentrant Insulating Phase and the Zero Field Metal-Insulator Transition in a 2D Hole System
• Spin polarization induced tenfold magneto-resistivity of highly metallic 2D holes in a narrow GaAs quantum well
• Temperature and Magnetic Field Enhanced Hall Slope of a Dilute 2D Hole System in the Ballistic Regime
• Large Magnetoresistance of a Dilute $p$-Si/SiGe/Si Quantum Well in a Parallel Magnetic Field
• In-Plane Magnetodrag between Dilute Two-Dimensional Systems
• Quantum oscillations observed in graphene at microwave frequencies
• Degenerate versus semi-degenerate transport in a correlated 2D hole system
• 1/f noise in a dilute GaAs two-dimensional hole system in the insulating phase
• Spectrum of an open disordered quasi-two-dimensional electron system: strong orbital effect of the weak in-plane magnetic field
• Spin effect on the low-temperature resistivity maximum in a strongly interacting 2D electron system
• Impact of Short-Range Scattering on the Metallic Transport of Strongly Correlated 2D Holes in GaAs Quantum Wells
• Metal-insulator transition in a two-dimensional electron system: the orbital effect of in-plane magnetic field