Measurements of composite fermion conductivity dependence on carrier density

2004/02/06 by C. -T. Liang, C-T Liang, M. Y. Simmons +5
Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum and electron transport phenomena #Rare-earth and actinide compounds #cond-mat.mes-hall

paper · pdf · doi:10.1088/0953-8984/16/7/009

published as J. Phys.: Condens. Matter 16, 1095 (2004) · 6 pages, 7 figures. We present the first experimental study of the carrier density dependence of the composite fermion conductivity $σ^{CF}_{xx}$ at Landau level filling factors $ν= {1/2}$ and $ν= {3/2}$ in high-quality front-gated GaAs/Al$_{0.33}$Ga$_{0.67}$As heterostructures

openalex publication_date 2004/02/06 · arxiv created 2005/03/17 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

We present the first experimental study of the carrier density dependence of the composite fermion conductivity σ^CF_xx at Landau level filling factors ν= 1/2 and ν= 3/2 in high-quality front-gated GaAs/Al_0.33Ga_0.67As heterostructures. Extracting α from the power law ln(σ^CF_xx) ∝ ln(n_e)^α shows that α ≈ 1. The measured α ≈ 1 is placed between the predicted value 3/4 in the strong random magnetic field regime, and 3/2 in the weak random magnetic field regime. Comparisons between our results and theory are discussed.

Citations

• Composite Fermions in a Long-Range Random Magnetic Field: Quantum Hall Effect versus Shubnikov–de Haas Oscillations

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