Volume 45, Number 3, February 1999
|Page(s)||374 - 380|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 September 2002|
Highly disordered two-dimensional electron system in a weak magnetic field
Institute of Physics, Academy of Sciences of the Czech Republic
Cukrovarnická 10, 162 53 Praha 6, Czech Republic
2 TIS-CG Erlangen - Rathsbergerstr. 41C, 91054 Erlangen, Germany
3 Institute of Electrical Engineering, Slovak Academy of Sciences Dubravská 9, 842 39 Bratislava, Slovakia
Accepted: 25 November 1998
The highly disordered two-dimensional electron gas contained in multi-δ-layers was experimentally investigated by a magnetotransport method to obtain information about the nature of electron states in the range of weak magnetic fields. The data observed have been found to be in conflict with the widely accepted floating of the extended states at vanishing magnetic fields and we have suggested an alternative interpretation of the data as a direct transition from an integral quantum Hall liquid to a two-dimensional disordered conductor with the transport controlled by weakly localized states.
PACS: 73.20.Dx – Electron states in low-dimensional structures (superlattices, quantum well structures and multilayers) / 73.20.Fz – Weak or Anderson localization / 73.20.Jc – Delocalization processes
© EDP Sciences, 1999
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