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20 April 2024

» arxiv » cond-mat/0503478

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Topological defects in the edge state structure in a bilayer electron system
E.V. Deviatov ; V.T. Dolgopolov ; A. Wurtz ; A. Lorke ; A. Wixforth ; W. Wegscheider ; K.L. Campman ; A.C. Gossard ;
Date:	18 Mar 2005
Subject:	Mesoscopic Systems and Quantum Hall Effect \| cond-mat.mes-hall
Abstract:	We experimentally demonstrate, for the first time, formation of point-like topological defects in the edge state structure in the quantum Hall effect regime. By using of a selective population technique, we investigate equilibration processes between the edge states in bilayer electron structures with a high tunnelling rate between layers. Unexpected flattening of the I-V curves in perpendicular magnetic field at a specific filling factor combination and the recovery of the conventional nonlinear I-V characteristics in tilted fields give a strong evidence for the existence of topological defects.
Source:	arXiv, cond-mat/0503478
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