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Phys. Rev. B 74, 195313 (2006) [5 pages]

Two-subband quantum Hall effect in parabolic quantum wells

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C. Ellenberger1, B. Simovič1, R. Leturcq1, T. Ihn1, S. E. Ulloa1,*, K. Ensslin1, D. C. Driscoll2, and A. C. Gossard2
1Solid State Physics Laboratory, ETH Zurich, 8093 Zurich, Switzerland
2Materials Department, University of California, Santa Barbara, California 93106, USA

Received 7 June 2006; revised 20 September 2006; published 8 November 2006

The low-temperature magnetoresistance of parabolic quantum wells displays pronounced minima between integer filling factors. Concomitantly the Hall effect exhibits overshoots and plateaulike features next to well-defined ordinary quantum Hall plateaus. These effects set in with the occupation of the second subband. We discuss our observations in the context of single-particle Landau fan charts of a two-subband system empirically extended by a density dependent subband separation and an enhanced spin splitting g*.

© 2006 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.74.195313
DOI:
10.1103/PhysRevB.74.195313
PACS:
73.43.−f

*Permanent address: Department of Physics and Astronomy, Ohio University, Athens, Ohio 45701-2979, USA.

 
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