Commensurate Composite Fermions in Weak Periodic Electrostatic Potentials: Direct Evidence of a Periodic Effective Magnetic Field

J. H. Smet, S. Jobst, K. von Klitzing, D. Weiss, W. Wegscheider, and V. Umansky
Phys. Rev. Lett. 83, 2620 – Published 27 September 1999
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Abstract

Within the composite fermion model, it is anticipated that a periodic variation of the density in a two-dimensional electron system at half filling produces a periodic fictitious magnetic field. In regions of smaller density fictitious flux quanta are missing to compensate the external magnetic field. The observation of magnetic commensurability minima in the dc-transport response furnishes evidence for this fundamental aspect of the composite fermion picture. In general, composite fermions in these modulated systems behave largely equivalent to electrons moving in a periodic magnetic field.

  • Received 14 January 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.2620

©1999 American Physical Society

Authors & Affiliations

J. H. Smet1, S. Jobst2, K. von Klitzing1, D. Weiss2, W. Wegscheider3, and V. Umansky4

  • 1Max-Planck-Institut für Festkörperforschung, Heisenbergstraße 1, D-70569 Stuttgart, Germany
  • 2Institut für Experimentelle und Angewandte Physik, Universität Regensburg, D-93040 Regensburg, Germany
  • 3Walter-Schottky-Institut, Technische Universität München, Am Coulombwall, D-85748 Garching, Germany
  • 4Braun Center for Submicron Research, Weizmann Institute of Science, Rehovot 76100, Israel

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Issue

Vol. 83, Iss. 13 — 27 September 1999

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