Weak localisation, hole-hole interactions and the "metal"-insulator transition in two dimensions

Abstract

A detailed investigation of the metallic behaviour in high quality GaAs-AlGaAs two dimensional hole systems reveals the presence of quantum corrections to the resistivity at low temperatures. Despite the low density ($r_s>10$) and high quality of these systems, both weak localisation (observed via negative magnetoresistance) and weak hole-hole interactions (giving a correction to the Hall constant) are present in the so-called metallic phase where the resistivity decreases with decreasing temperature. The results suggest that even at high $r_s$ there is no metallic phase at T=0 in two dimensions.

5 pages, 4 figures

References in corpus (2)

• Nonmonotonic Temperature-dependent Resistance in Low Density 2D Hole Gases
• Weak localisation in AlGaAs/GaAs p-type quantum wells

Cited by in corpus (41)

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• Frictional Drag between Two Dilute Two-Dimensional Hole Layers
• Magnetoresistance and dephasing in a two-dimensional electron gas at intermediate conductances
• Novel Phenomena in Dilute Electron Systems in Two Dimensions
• Exclusion of quantum coherence as the origin of the 2D metallic state in high-mobility silicon inversion layers
• Screening and transport in 2D semiconductor systems at low temperatures
• Analysis of the Metallic Phase of Two-Dimensional Holes in SiGe in Terms of Temperature Dependent Screening
• Fermi-liquid behaviour of the low-density 2D hole gas in GaAs/AlGaAs heterostructure at large values of r_s
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• Low-Temperature Collapse of Electron Localisation in Two Dimensions
• Low-field magnetoresistance in GaAs 2D holes
• Disappearance of the metal-like behavior in GaAs two-dimensional holes below 30 mK
• No indications of metal-insulator transition for systems of interacting electrons in two dimensions
• The relative importance of electron-electron interactions compared to disorder in the two-dimensional "metallic" state
• Non-perturbative saddle point for the effective action of disordered and interacting electrons in 2D
• Quantum phase transitions in two-dimensional systems
• Hole-hole interaction in a strained In${}_x$Ga${}_{1-x}$As two dimensional system
• Spin-orbit interaction and the 'metal-insulator' transition observed in two-dimensional hole systems
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• Interaction Correction to the Longitudinal Conductivity and Hall Resistivity in High Quality Two-Dimensional GaAs Electron and Hole Systems
• The Parallel Magnetoconductance of Interacting Electrons in a Two Dimensional Disordered System
• Probing Landau quantisation with the presence of insulator-quantum Hall transition in a GaAs two-dimensional electron system
• Probing onset of strong localization and electron-electron interactions with the presence of direct insulator-quantum Hall transition
• Insulator, semiclassical oscillations and quantum Hall liquids at low magnetic fields
• Termination of two-dimensional metallic conduction near metal-insulator transition in a Si/SiGe quantum well
• Observation of geometry dependent conductivity in two-dimensional electron systems
• Weak localization of holes in high-mobility heterostructures
• Two-Component Scaling near the Metal-Insulator Bifurcation in Two-Dimensions
• Persistent currents in two dimensions: New regimes induced by the interplay between electronic correlations and disorder
• Thermoelectric and electrical transport in mesoscopic two-dimensional electron gases
• From the Fermi Liquid Towards the Wigner Solid in Two Dimensions
• Emergence of quasi-metallic state in disordered 2D electron gas due to strong interactions
• Metal-insulator transition in 2D: the role of interactions and disorder