Direct observation of micron-scale ordered structure in a two-dimensional electron system

I. J. Maasilta, Subhasish Chakraborty, I. Kuljanishvili, S. H. Tessmer, and M. R. Melloch
Phys. Rev. B 68, 205328 – Published 24 November 2003
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Abstract

We have extended the subsurface charge accumulation imaging method to directly resolve the interior structure of a GaAs/AlGaAs two-dimensional electron system in a tunneling geometry. We find that the application of a perpendicular magnetic field can induce surprising density modulations that are not static as a function of the field. Near six and four filled Landau levels, stripelike structures emerge with a characteristic length scale 2μm. Present theories do not account for ordered density modulations on this scale.

  • Received 29 March 2003

DOI:https://doi.org/10.1103/PhysRevB.68.205328

©2003 American Physical Society

Authors & Affiliations

I. J. Maasilta*, Subhasish Chakraborty, I. Kuljanishvili, and S. H. Tessmer

  • Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA

M. R. Melloch

  • Department of Electrical Engineering, Purdue University, West Lafayette, Indiana 47907, USA

  • *Current address: Dept. of Physics, P.O. Box 35, FIN-40014, Univ. of Jyväskylä, Finland.

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Vol. 68, Iss. 20 — 15 November 2003

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