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Determination of the resistance across incompressible strips through imaging of charge motion P. I. Glicofridis, G. Finkelstein,* and R. C. Ashoori
 

Summary: Determination of the resistance across incompressible strips through imaging of charge motion
P. I. Glicofridis, G. Finkelstein,* and R. C. Ashoori
Department of Physics and Center for Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge,
Massachusetts 02139
M. Shayegan
Department of Electrical Engineering, Princeton University, Princeton, New Jersey 08544
Received 18 October 2001; published 13 March 2002
Using charge-accumulation imaging, we measure the charge flow across an incompressible strip and follow
its evolution with magnetic field. The strip runs parallel to the edge of a gate deposited on the sample and
forms at positions where an exact number of integer Landau levels is filled. An RC model of charging fits the
data well and enables us to determine the resistance across the strip. Surprisingly, we find that the strip
becomes more resistive as its width decreases.
DOI: 10.1103/PhysRevB.65.121312 PACS number s : 73.43. f, 73.43.Fj, 73.23. b, 73.40. c
The edge-state picture of transport in a two-dimensional
electron gas 2DEG in a strong magnetic field appears to
explain several key properties of the 2DEG in the quantum
Hall effect QHE regime. The intersection between the con-
stant Fermi energy and the Landau-level energy near the
edge of the 2DEG determines the spatial location of the edge
states.1

  

Source: Ashoori, Raymond - Department of Physics, Massachusetts Institute of Technology (MIT)
Finkelstein, Gleb - Department of Physics, Duke University

 

Collections: Physics