Pinning modes of high-magnetic-field Wigner solids with controlled alloy disorder

B. H. Moon, L. W. Engel, D. C. Tsui, L. N. Pfeiffer, K. W. West

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


For a series of samples with two-dimensional electron systems in dilute AlxGa1-xAs, with varying x from 0% to 0.85%, we survey the pinning mode resonances of Wigner solids at the low Landau filling termination of the fractional quantum Hall effect series. For all x studied, the pinning modes are present with frequencies fpk that are consistent with collective weak pinning. For x≥0.22% we find fpk vs B exhibits a rapid increase that is not present for x=0. We find the observed fpk is much smaller than values calculated with a simple Wigner solid model which neglects the effects of the disorder on the charge distribution of a carrier.

Original languageEnglish (US)
Article number075310
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number7
StatePublished - Feb 24 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics


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