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. Gossard
Institute 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.
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