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From quantized states to percolation: Scanning tunneling spectroscopy of a strongly disordered two-dimensional electron system

J. Wiebe, Chr. Meyer, J. Klijn, M. Morgenstern, and R. Wiesendanger
Phys. Rev. B 68, 041402(R) – Published 18 July 2003
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Abstract

Low-temperature scanning tunneling spectroscopy is used to study the local density of states (LDOS) of an adsorbate induced two-dimensional electron system in a strong disorder potential. At low energy, completely confined states of s- and p-character are found in the valleys of the potential landscape. With increasing energy the whole area becomes filled with LDOS indicating percolation. The percolation threshold is marked by a significant decrease in the LDOS corrugation. Interestingly, we do not find a dominating wavelength in the Fourier transforms of the LDOS, suggesting that classical percolation is a reasonable concept to describe the transition.

  • Received 10 April 2003

DOI:https://doi.org/10.1103/PhysRevB.68.041402

©2003 American Physical Society

Authors & Affiliations

J. Wiebe, Chr. Meyer, J. Klijn, M. Morgenstern, and R. Wiesendanger

  • Institute of Applied Physics, Hamburg University, Jungiusstraße 11, D–20355 Hamburg, Germany

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Vol. 68, Iss. 4 — 15 July 2003

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