Inequivalence of the low-density insulating state and quantum Hall insulating states in a strongly correlated two-dimensional electron system

Abstract

We find that the behaviors of the voltage-current characteristics as one enters the low-density insulating state and integer quantum Hall insulating states in the ultra-clean two-dimensional electron system in SiGe/Si/SiGe quantum wells are qualitatively different. The double-threshold voltage-current curves, representative of the electron solid formation at low densities, are not observed in the quantum Hall regime, which does not confirm the existence of a quasi-particle quantum Hall Wigner solid and indicates that quasi-particles near integer filling do not form an independent subsystem.

arXiv commentAs published

References in corpus (26)

• Correlation lengths of Wigner crystal order in two dimensional electron system at high magnetic field
• Direct observation of a magnetic field-induced Wigner crystal
• Microwave Resonance of 2D Wigner Crystal around integer Landau fillings
• Competing correlated states around the zero field Wigner crystallization transition of electrons in two-dimensions
• NMR profiling of quantum electron solids in high magnetic fields
• Evidence of a first order phase transition between Wigner crystal and Bubble Phases of 2D electrons in higher Landau levels
• Observation of pinning mode in Wigner solid of 1/3 fractional quantum Hall excitations
• Ultra-high mobility two-dimensional electron gas in a SiGe/Si/SiGe quantum well
• Transport evidence for a sliding two-dimensional quantum electron solid
• Evidence of a two-stage melting of Wigner solids in two dimensions
• Fractional Quantum Hall Effect and Wigner Crystal of Two-Flux Composite Fermions
• Anisotropic, two-dimensional, disordered Wigner solid
• Observation of reentrant quantum Hall states in the lowest Landau level
• Wigner crystalization about $\nu$=3
• Moving crystal phases of a quantum Wigner solid in an ultra-high-quality 2D electron system
• Connecting the Reentrant Insulating Phase and the Zero Field Metal-Insulator Transition in a 2D Hole System
• Microwave spectroscopic observation of distinct electron solid phases in wide quantum wells
• Unusual anisotropy of inplane field magnetoresistance in ultra-high mobility SiGe/Si/SiGe quantum wells
• The Quantum Hall Effect in the Absence of Disorder
• Pinning modes of high magnetic field Wigner solids with controlled alloy disorder
• Magnetotransport patterns of collective localization near $\nu =1$ in a high-mobility two-dimensional electron gas
• Collective depinning and sliding of a quantum Wigner solid in a 2D electron system
• Triple-top-gate technique for studying the strongly interacting 2D electron systems in heterostructures
• Thermal Activation Signatures of the Anderson Insulator and the Wigner Solid forming near $\nu =1$
• Stabilization of a two-dimensional quantum electron solid in perpendicular magnetic fields
• Density Dependence of the Phases of the $\nu =1$ Integer Quantum Hall Plateau in Low Disorder Electron Gases

Cited by in corpus (1)

• Quantum Wigner solid in two-dimensional electron systems in semiconductors