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Phys. Rev. B 64, 041310 (2001) [4 pages]

Imaging interedge-state scattering centers in the quantum Hall regime

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Michael T. Woodside1, Chris Vale1, Paul L. McEuen1, C. Kadow2, K. D. Maranowski2, and A. C. Gossard2
1Department of Physics, University of California and Materials Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720
2Materials Department, University of California, Santa Barbara, California 93106

Rapid Communication Received 23 April 2001; published 6 July 2001

We use an atomic force microscope tip as a local gate to study the scattering between edge channels in a two-dimensional electron gas in the quantum Hall regime. The scattering is dominated by individual, microscopic scattering centers, which we directly image here for the first time. The tip voltage dependence of the scattering indicates the presence of tunneling through weak links as well as scattering from microscopic impurities.


©2001 The American Physical Society

URL: http://link.aps.org/abstract/PRB/v64/e041310
DOI: 10.1103/PhysRevB.64.041310
PACS: 73.43.-f, 68.37.-d, 72.10.Fk, 73.23.-b

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