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| VOLUME 79 (2004) | ISSUE 4 | PAGE 206 |
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Manifestation of the bulk phase transition in the edge energy spectrum in a two dimensional bilayer electron system
E. V. Deviatov, A. Würtz+, A. Lorke+, M. Yu. Melnikov, V. T. Dolgopolov, A. Wixforth*, K. L. Campman
 , A. C. GossardInstitute of Solid State Physics RAS, Chernogolovka, Moscow District 142432, Russia +Laboratorium für Festkörperphysik, Universität Duisburg-Essen, D-47048 Duisburg, Germany *Institut für Physik, Universitat Augsburg, Universitatsstrasse, 1 D-86135 Augsburg, Germany Materials Department and Center for Quantized Electronic Structures, University of California,Santa Barbara, California 93106, USA PACS: 71.30.+h, 73.40.Qv
Abstract
We use a quasi-Corbino sample geometry with independent contacts to different edge states in the quantum Hall effect regime to investigate the edge energy spectrum of a bilayer electron system at total filling factor ν=2. By analyzing non-linear I-V curves in normal and tilted magnetic fields we conclude that the edge energy spectrum is in a close connection with the bulk one. At the bulk phase transition spin-singlet - canted antiferromagnetic phase I-V curve becomes linear, indicating the disappearance or strong narrowing of the ν=1 incompressible strip at the edge of the sample. |