Connecting the Reentrant Insulating Phase and the Zero Field Metal-Insulator Transition in a 2D Hole System

Abstract

We present the transport and capacitance measurements of 10nm wide GaAs quantum wells with hole densities around the critical point of the 2D metal-insulator transition (critical density $p_c$ down to 0.8$\times 10^{10}$/cm${}^2$, $r_s\sim$36). For metallic hole density $p_c<p<p_c+0.15\times 10^{10}$/cm${}^2$, a reentrant insulating phase (RIP) is observed between the $\nu$=1 quantum Hall state and the zero field metallic state and is attributed to the formation of pinned Wigner crystal. Through studying the evolution of the RIP versus 2D hole density by transport and capacitance experiments, we show that the RIP is incompressible and continuously connected to the zero field insulator, suggesting a similar origin for these two phases.

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References in corpus (7)

• Phase Diagram of the Low-Density Two-Dimensional Homogeneous Electron Gas
• Evidence for Two Different Solid Phases of Two Dimensional Electrons in High Magnetic Fields
• Observation of pinning mode in Wigner solid of 1/3 fractional quantum Hall excitations
• Strongly Enhanced Hole-Phonon Coupling in the Metallic State of the Dilute Two-Dimensional Hole Gas
• Temperature and Magnetic Field Enhanced Hall Slope of a Dilute 2D Hole System in the Ballistic Regime
• Wigner Crystallization in a Quasi-3D Electronic System
• Degenerate versus semi-degenerate transport in a correlated 2D hole system

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• Recent developments in the field of the metal-insulator transition in two dimensions
• Metallic state in a strongly interacting spinless two-valley electron system in two dimensions
• Stabilization of a two-dimensional quantum electron solid in perpendicular magnetic fields
• Electronic Crystal Phases in the Presence of Non-Uniform Berry Curvature and Tunable Berry Flux: The ${\lambda }_N$-Jellium model
• Coexistence of two hole phases in high-quality $p$-GaAs/AlGaAs in the vicinity of Landau level filling factors $\nu$=1 and $\nu$=(1/3)
• Impact of Short-Range Scattering on the Metallic Transport of Strongly Correlated 2D Holes in GaAs Quantum Wells
• Inequivalence of the low-density insulating state and quantum Hall insulating states in a strongly correlated two-dimensional electron system
• Surprising coincidence of the apparent 2D metal-to-insulator transition data with Fermi-gas based model results
• Evidence for a New Intermediate Phase in a Strongly Correlated 2D System near Wigner Crystallization
• Quantum Wigner solid in two-dimensional electron systems in semiconductors
• Quantum melting a Wigner crystal into Hall liquids