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Modeling subsurface charge accumulation images of a quantum Hall liquid S. H. Tessmer
 

Summary: Modeling subsurface charge accumulation images of a quantum Hall liquid
S. H. Tessmer
Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824
G. Finkelstein,* P. I. Glicofridis, and R. C. Ashoori
Department of Physics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139
Received 10 April 2002; published 12 September 2002
Subsurface charge accumulation imaging is a cryogenic scanning probe technique that has recently been
used to spatially probe incompressible strips formed in a two-dimensional electron system 2DES at high
magnetic fields. In this paper, we present a detailed numerical modeling of these data. At a basic level, the
method produces results that agree well with the predictions of models based on simple circuit elements.
Moreover, the modeling method is sufficiently advanced to simulate spatially resolved measurements. By
comparing directly the simulations to the experimentally measured data, we can extract quantitatively local
electronic features of the 2DES. In particular, we deduce the electron density of states inside the incompress-
ible strips and electrical resistance across them.
DOI: 10.1103/PhysRevB.66.125308 PACS number s : 73.40. c, 73.23. b, 73.20. r
I. INTRODUCTION
Recently developed scanning probe microscopy methods
based on electric-field sensing provide a new window into
the quantum mechanics of confined systems and may play a
significant role in characterizing future nanoelectronic

  

Source: Ashoori, Raymond - Department of Physics, Massachusetts Institute of Technology (MIT)
Finkelstein, Gleb - Department of Physics, Duke University
Tessmer, Stuart - Department of Physics and Astronomy, Michigan State University

 

Collections: Materials Science; Physics