Observation of An Anisotropic Wigner Crystal

Abstract

We report a new correlated phase of two-dimensional charged carriers in high magnetic fields, manifested by an anisotropic insulating behavior at low temperatures. It appears near Landau level filling factor $\nu =1/2$ in hole systems confined to wide GaAs quantum wells when the sample is tilted in magnetic field to an intermediate angle. The parallel field component ($B_{||}$) leads to a crossing of the lowest two Landau levels, and an elongated hole wavefunction in the direction of $B_{||}$. Under these conditions, the in-plane resistance exhibits an insulating behavior, with the resistance along $B_{||}$ more than 10 times smaller than the resistance perpendicular to $B_{||}$. We interpret this anisotropic insulating phase as a two-component, striped Wigner crystal.

References in corpus (6)

• Tilt-Induced Anisotropic to Isotropic Phase Transition at $\nu =5/2$
• $\nu =1/2$ Fractional Quantum Hall Effect in Tilted Magnetic Fields
• Fractional quantum Hall states versus Wigner crystals in wide quantum wells in the half-filled lowest and second Landau levels
• Evidence for a new symmetry breaking mechanism reorienting quantum Hall nematics
• Microwave spectroscopic studies of the bilayer electron solid states at low Landau filling in a wide quantum well
• Unusual Landau Level Pinning and Correlated $\nu =1$ Quantum Hall Effect in Hole Systems Confined to Wide GaAs Quantum Wells

Cited by in corpus (8)

• Anisotropic, two-dimensional, disordered Wigner solid
• Geometric Resonance of Composite Fermions near Bilayer Quantum Hall States
• Record-quality GaAs two-dimensional hole systems
• Robust Quantum Hall Ferromagnetism near a Gate-Tuned ν = 1 Landau Level Crossing
• Highly-Anisotropic Even-Denominator Fractional Quantum Hall State in an Orbitally-Coupled Half-Filled Landau Level
• Morphing of 2D Hole Systems at $\nu =3/2$ in Parallel Magnetic Fields: Compressible, Stripe, and Fractional Quantum Hall Phases
• Ultraclean two-dimensional hole systems with mobilities exceeding 10${}^7$ cm${}^2$/Vs
• Full, three-quarter, half and quarter Wigner crystals in Bernal bilayer graphene