Phys. Rev. B 68, 205328 (2003) [6 pages]Direct observation of micron-scale ordered structure in a two-dimensional electron systemReceived 29 March 2003; revised 9 June 2003; published 24 November 2003 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. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.68.205328
DOI:
10.1103/PhysRevB.68.205328
PACS:
73.43.Jn, 73.20.-r, 73.43.Fj
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