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Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips

Suddards, M.E.; Baumgartner, A.; Henini, M.; Mellor, Christopher J.

Authors

M.E. Suddards

A. Baumgartner

M. Henini

Christopher J. Mellor



Abstract

We use dynamic scanning capacitance microscopy to image compressible and incompressible strips at the edge of a Hall bar in a two-dimensional electron gas (2DEG) in the quantum Hall effect (QHE) regime. This method gives access to the complex local conductance, Gts, between a sharp metallic tip scanned across the sample surface and ground, comprising the complex sample conductance. Near integer filling factors we observe a bright stripe along the sample edge in the imaginary part of Gts. The simultaneously recorded real part exhibits a sharp peak at the boundary between the sample interior and the stripe observed in the imaginary part. The features are periodic in the inverse magnetic field and consistent with compressible and incompressible strips forming at the sample edge. For currents larger than the critical current of the QHE break-down the stripes vanish sharply and a homogeneous signal is recovered, similar to zero magnetic field. Our experiments directly illustrate the formation and a variety of properties of the conceptually important QHE edge states at the physical edge of a 2DEG.

Journal Article Type Article
Publication Date Aug 1, 2012
Journal New Journal of Physics
Electronic ISSN 1367-2630
Publisher IOP Publishing
Peer Reviewed Peer Reviewed
Volume 14
Article Number 08315
APA6 Citation Suddards, M., Baumgartner, A., Henini, M., & Mellor, C. J. (2012). Scanning capacitance imaging of compressible and incompressible quantum Hall effect edge strips. New Journal of Physics, 14, doi:10.1088/1367-2630/14/8/083015
DOI https://doi.org/10.1088/1367-2630/14/8/083015
Publisher URL http://iopscience.iop.org/1367-2630/14/8/083015
Copyright Statement Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-sa/4.0
Additional Information Some volumes prior to November 2012 may have been published under a Creative Commons Attribution Non-Commercial Share Alike License, please check individual journals for confirmation.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://creativecommons.org/licenses/by-sa/4.0





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