Anisotropic composite fermions and fractional quantum Hall effect

Abstract

We study the role of anisotropy on the transport properties of composite fermions near Landau level filling factor $\nu =1/2$ in two-dimensional holes confined to a GaAs quantum well. By applying a parallel magnetic field, we tune the composite fermion Fermi sea anisotropy and monitor the relative change of the transport scattering time at $\nu =1/2$ along the principal directions. Interpreted in a simple Drude model, our results suggest that the scattering time is longer along the longitudinal direction of the composite fermion Fermi sea. Furthermore, the measured energy gap for the fractional quantum Hall state at $\nu =2/3$ decreases when anisotropy becomes significant. The decrease, however, might partly stem from the charge distribution becoming bilayer-like at very large parallel magnetic fields.

References in corpus (20)

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• Anisotropic Fermi Contour of (001) GaAs Holes in Parallel Magnetic Fields

Cited by in corpus (10)

• Electronics and optoelectronics of quasi-one dimensional layered transition metal trichalcogenides
• Transference of Fermi Contour Anisotropy to Composite Fermions
• Numerical study of anisotropy in a composite Fermi liquid
• Anisotropy Driven Transition from Moore-Read State to Quantum Hall Stripes
• Quantum Hall Valley Nematics
• Valley Stoner Instability of the Composite Fermi Sea
• Tuning of Fermi Contour Anisotropy in GaAs (001) 2D Holes via Strain
• $2{\mathbf{k}}_{\mathbf{F}}$ Density Wave Instability of Composite Fermi Liquid
• Anisotropy and quench dynamics of quasiholes in fractional quantum Hall liquids
• Exchange effect and magneto-plasmon mode dispersion in an anisotropic two-dimensional electronic system