Current breakdown of the integer and fractional quanum Hall effects detected by torque magnetometry

Matthews, A. J., Watts, J. P., Zhu, M., Usher, A., Elliott, Martin ORCID: https://orcid.org/0000-0002-9254-9898, Herrenden-Harker, William, Morris, P. R., Simmons, M. Y. and Ritchie, D. A. 2000. Current breakdown of the integer and fractional quanum Hall effects detected by torque magnetometry. Physica E: Low-dimensional Systems and Nanostructures 6 (1-4) , pp. 140-143. 10.1016/S1386-9477(99)00079-X

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Abstract

We have developed a novel technique that enables measurements of the breakdown of both the integer and fractional quantum Hall effects in a two-dimensional electron system without the need to contact the sample. The critical Hall electric fields that we measure are significantly higher than those reported by other workers, and support the quasi-elastic inter-Landau-level tunnelling model of breakdown. Comparison of the fractional quantum Hall effect results with those obtained on the integer quantum Hall effect allows the fractional quantum Hall effect energy gap to be determined and provides a test of the composite-fermion theory. The temperature dependence of the critical current gives an insight into the mechanism by which momentum may be conserved during the breakdown process.

Item Type:	Article
Date Type:	Publication
Status:	Published
Schools:	Physics and Astronomy
Subjects:	Q Science > QC Physics
Uncontrolled Keywords:	Quantum Hall effect; Fractional quantum Hall effect; Magnetisation
Publisher:	Elsevier
ISSN:	1386-9477
Last Modified:	25 Oct 2022 09:39
URI:	https://orca.cardiff.ac.uk/id/eprint/59505

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