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RF Conductivity Study of Electron Correlations in the Small Filling-Factor Limit

  • M. A. Paalanen
  • L. Willett
  • R. R. Ruel
  • K. W. West
  • L. N. Pfeiffer
Conference paper
Part of the Springer Series in Solid-State Sciences book series (SSSOL, volume 111)

Abstract

We have determined the dynamical conductivity σ(k,ω) of the 2D electrons in high mobility GaAs/AlGaAs heterostructures by measuring the attenuation and velocity of surface acoustic waves as a function of magnetic field, temperature and frequency. In the small filling factor limit of the lowest Landau level we find a broad conductivity resonance with a sharp onset temperature. We interpret this resonance as a pinning mode of the Wigner glass rather than the ω ∝ k 3/2 shear mode expected in a perfect crystal. This pinning mode contributes to both the real and the imaginary part of the conductivity, and is centered at about 1 GHz frequency. From the pinning frequency we get a rough estimate of ξ ≈ 1 µm for the correlation length of the Wigner crystal

Keywords

Filling Factor Surface Acoustic Wave High Magnetic Field Ohmic Loss Ohmic Heating 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer-Verlag Berlin Heidelberg 1992

Authors and Affiliations

  • M. A. Paalanen
    • 1
  • L. Willett
    • 1
  • R. R. Ruel
    • 1
  • K. W. West
    • 1
  • L. N. Pfeiffer
    • 1
  1. 1.AT&T Bell LaboratoriesMurray HillUSA

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