GHz surface acoustic waves as a probe of composite fermions in two-dimensional electron systems

R. L. Willett, L. N. Pfeiffer

Research output: Contribution to journalArticlepeer-review

1 Scopus citations

Abstract

By probing the low-disorder two-dimensional electron system at submicron dimensions, important new length scales are revealed. Using surface acoustic waves of wavelength λ ≲ 1 μm to measure the 2D electron conductivity, enhanced conductivity is observed at even-denominator filling factors v = 1/2, 1/4: this represents measurement of composite fermions' conductivity at a dimension smaller than the quasiparticles' mean free path. At smaller λ we are able to observe geometric resonance of the composite fermions' cyclotron orbit and the ultrasound wavelength. Observation of this resonance allows measurement of the composite fermion Fermi wave vector.

Original languageEnglish (US)
Pages (from-to)1-4
Number of pages4
JournalPhysica B: Condensed Matter
Volume219-220
Issue number1-4
DOIs
StatePublished - Apr 1 1996
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering

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