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Transport studies of localized and extended states of a two-dimensional electron gas in low magnetic fields

Hayne, M and Usher, Alan and Harris, Jeffery J and Foxon, C Tom (1997) Transport studies of localized and extended states of a two-dimensional electron gas in low magnetic fields. Physica E: Low-dimensional Systems and Nanostructures, 1 (1-4). pp. 125-128. ISSN 1386-9477

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Abstract

We have observed the quantum Hall effect in a high mobility two-dimensional electron gas to filling factors up to 80 at 0.3 K. This demonstrates the presence of both localized and extended states at low field, and explains the failure of the standard semi-classical analysis of Shubnikov-de Haas (SdH) oscillations in this regime. We go on to derive a general expression for the conductivity due to rectangular bands of extended states, and show that the observed temperature dependence of the SdH oscillations is consistent with this picture. An analysis of the oscillations using this expression reveals the predicted levitation of the extended states as the magnetic field is reduced. (C) 1997 Elsevier Science B.V. All rights reserved.

Item Type: Article
Journal or Publication Title: Physica E: Low-dimensional Systems and Nanostructures
Uncontrolled Keywords: Shubnikov-de Haas ; quantum Hall effect ; levitation ; CONDUCTIVITY
Subjects:
Departments: Faculty of Science and Technology > Physics
ID Code: 51939
Deposited By: ep_importer_pure
Deposited On: 09 Dec 2011 10:20
Refereed?: Yes
Published?: Published
Last Modified: 09 Apr 2014 22:56
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/51939

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