Charge metastability and hysteresis in the quantum Hall regime

Abstract

We report simultaneous quasi-dc magnetotransport and high frequency surface acoustic wave measurements on bilayer two-dimensional electron systems in GaAs. Near strong integer quantized Hall states a strong magnetic field sweep hysteresis in the velocity of the acoustic waves is observed at low temperatures. This hysteresis indicates the presence of a metastable state with anomalously high conductivity in the interior of the sample. This non-equilibrium state is not revealed by conventional low frequency transport measurements which are dominated by dissipationless transport at the edge of the 2D system. We find that a field-cooling technique allows the equilibrium charge configuration within the interior of the sample to be established. A simple model for this behavior is discussed.

arXiv comment8 pages, 4 postscript figures

References in corpus (16)

• Resistance Spikes at Transitions between Quantum Hall Ferromagnets
• First-Order Phase Transition in a Quantum Hall Ferromagnet
• Pseudospin Anisotropy Classification of Quantum Hall Ferromagnets
• A New Type of Electron Nuclear-Spin Interaction from Resistively Detected NMR in the Fractional Quantum Hall Effect Regime
• Coupling of Surface Acoustic Waves to a Two Dimensional Electron Gas
• Quantum Hall Ferromagnetism in a Two-Dimensional Electron System
• Metastable Resistance Anisotropy Orientation of Two-Dimensional Electrons in High Landau Levels
• Reservoir model for two-dimensional electron gases in quantizing magnetic fields: a review
• Surface Acoustic Wave Propagation and Inhomogeneities in Low Density Two-Dimensional Electron Systems Near the Metal-Insulator Transition
• The influence of the long-lived quantum Hall potential on the characteristics of quantum devices
• Screening Model of Magnetotransport Hysteresis Observed in Bilayer Quantum Hall Systems
• Layer charge instability in unbalanced bilayer systems in the quantum Hall regime
• Hysteresis and Spikes in the Quantum Hall Effect
• Hysteresis in the quantum Hall regimes in electron double quantum well structures
• Crossover between localized states and pinned Wigner crystal in high-mobility n-GaAs/AlGaAs heterostructures near filling factor $\nu =1$
• Dynamics of Density Imbalanced Bilayer Holes in the Quantum Hall Regime

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