Fermi contour anisotropy of GaAs electron-flux composite fermions in parallel magnetic fields

D. Kamburov, M. A. Mueed, M. Shayegan, L. N. Pfeiffer, K. W. West, K. W. Baldwin, J. J.D. Lee, R. Winkler

Research output: Contribution to journalArticlepeer-review

35 Scopus citations

Abstract

In high-quality two-dimensional electrons confined to GaAs quantum wells, near Landau level filling factors ν=1/2 and 1/4, we observe signatures of the commensurability of the electron-flux composite fermion cyclotron orbits with a unidirectional periodic density modulation. Focusing on the data near ν=1/2, we directly and quantitatively probe the shape of the composite fermions' cyclotron orbit, and therefore their Fermi contour, as a function of magnetic field (B) applied parallel to the sample plane. The composite fermion Fermi contour becomes severely distorted with increasing B and appears to be elliptical, in sharp contrast to the electron Fermi contour which splits as the system becomes bilayerlike at high B. We present a simple, qualitative model to interpret our findings.

Original languageEnglish (US)
Article number085304
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume89
Issue number8
DOIs
StatePublished - Feb 11 2014

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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