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Title: Unraveling Quantum Hall Breakdown in Bilayer Graphene with Scanning Gate Microscopy
Authors: Connolly, M.R.
Puddy, R.K.
Logoteta, D.
Marconcini, P.
Roy, Mervyn
Griffiths, J.P.
Jones, G.A.C.
Maksym, P.A.
Macucci, M.
Smith, C.G.
First Published: 18-Oct-2012
Publisher: American Chemical Society
Citation: Nano Letters, 2012, 12 (11), pp 5448–5454
Abstract: Investigating the structure of quantized plateaus in the Hall conductance of graphene is a powerful way of probing its crystalline and electronic structure and will also help to establish whether graphene can be used as a robust standard of resistance for quantum metrology. We use low-temperature scanning gate microscopy to image the interplateau breakdown of the quantum Hall effect in an exfoliated bilayer graphene flake. Scanning gate images captured during breakdown exhibit intricate patterns where the conductance is strongly affected by the presence of the scanning probe tip. The maximum density and intensity of the tip-induced conductance perturbations occur at half-integer filling factors, midway between consecutive quantum Hall plateau, while the intensity of individual sites shows a strong dependence on tip-voltage. Our results are well-described by a model based on quantum percolation which relates the points of high responsivity to tip-induced scattering in a network of saddle points separating localized states.
DOI Link: 10.1021/nl3015395
ISSN: 1530-6984
eISSN: 1530-6992
Version: Pre-print
Type: Journal Article
Rights: This document is the Submitted Manuscript version of a Published Work that appeared in final form in Nano Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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