University of Leicester
Browse
1201.4029v1.pdf (2.64 MB)

Unraveling Quantum Hall Breakdown in Bilayer Graphene with Scanning Gate Microscopy

Download (2.64 MB)
journal contribution
posted on 2013-09-09, 14:09 authored by M.R. Connolly, R.K. Puddy, D. Logoteta, P. Marconcini, Mervyn Roy, J.P. Griffiths, G.A.C. Jones, P.A. Maksym, M. Macucci, C.G. Smith
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.

History

Citation

Nano Letters, 2012, 12 (11), pp 5448–5454

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Physics and Astronomy

Version

  • AO (Author's Original)

Published in

Nano Letters

Publisher

American Chemical Society

issn

1530-6984

eissn

1530-6992

Copyright date

1021

Available date

2013-10-18

Publisher version

http://pubs.acs.org/doi/abs/10.1021/nl3015395

Language

en

Usage metrics

    University of Leicester Publications

    Categories

    No categories selected

    Exports

    RefWorks
    BibTeX
    Ref. manager
    Endnote
    DataCite
    NLM
    DC