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Title: Possible existence of a band of extended states induced by inter-Landau-band mixing in a quantum Hall system
Authors: Xiong, Gang
Wang, Shidong
Niu, Q.
Wang, Yupeng
Xie, X. C.
Tian, De-Cheng
Wang, Xiang-Rong
Keywords: Chirality
Landau levels
Localised states
Metal-insulator transition
Phase diagrams
Quantum Hall effect
Issue Date: 27-Jan-2006
Citation: Journal of physics. Condensed matter, v. 18, 2006, p. 2029–2055
Abstract: The mixing of states with opposite chiralities in a quantum Hall system is shown to have a delocalization effect. It is possible that extended states may form bands because of this mixing, as is shown through a numerical calculation on a two-channel network model. Based on this result, a new phase diagram with a narrow metallic phase separating two adjacent QH phases and/or separating a QH phase from the insulating phase is proposed. The data from recent non-scaling experiments are reanalysed and it is shown that they seem to be consistent with the new phase diagram. However, due to finite-size effects, further study on large system size is still needed to conclude whether there are extended state bands in the thermodynamic limit.
Rights: Journal of physics. Condensed matter © copyright (2006) IOP Publishing Ltd. The Journal's web site is located at
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