$\nu =1/2$ Fractional Quantum Hall Effect in Tilted Magnetic Fields

Abstract

Magnetotransport measurements on two-dimensional electrons confined to wide GaAs quantum wells reveal a remarkable evolution of the ground state at filling factor $\nu =1/2$ as we tilt the sample in the magnetic field. Starting with a compressible state at zero tilt angle, a strong $\nu =1/2$ fractional quantum Hall state appears at intermediate angles. At higher angles an insulating phase surrounds this state and eventually engulfs it at the highest angles. This evolution occurs because the parallel component of the field renders the charge distribution increasingly bilayer-like.

References in corpus (7)

• Non-Abelian Anyons and Topological Quantum Computation
• Observation of a Fractional Quantum Hall State at $\nu =1/4$ in a Wide GaAs Quantum Well
• Quantum Hall Phase Diagram of Half-filled Bilayers in the Lowest and the Second Orbital Landau Levels: Abelian versus Non-Abelian Incompressible Fractional Quantum Hall States
• Interaction-tuned compressible-to-incompressible phase transitions in the quantum Hall systems
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• Fractional quantum Hall state at ν=1/4 in a wide quantum well
• Subband Engineering Even-Denominator Quantum Hall States

Cited by in corpus (5)

• Even-Denominator Fractional Quantum Hall State at Filling Factor ν = 3/4
• Anisotropic composite fermions and fractional quantum Hall effect
• Valley-tunable, even-denominator fractional quantum Hall state in the lowest Landau level of an anisotropic system
• Composite fermions in a wide quantum well in the vicinity of the filling factor 1/2
• Collective excitations of quantum Hall states under tilted magnetic field