Possible existence of a band of extended states induced by inter-Landau-band mixing in quantum Hall system

Details Possible existence of a band of extended states induced by inter-Landau-band mixing in quantum Hall system Possible existence of a band of extended states induced by inter-Landau-band mixing in quantum Hall system

2005-12-16

arxiv.org/abs/cond-mat/0512374v1

J. Phys.: Condens. Matter 18(2006)2029

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

17 pages, 19 figures

Scientific paper

10.1088/0953-8984/18/6/017

The mixing of states with {\it opposite chirality} in quantum Hall system is shown to have 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 {\it 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 is reanalyzed and shown that they seem to be {\it 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 thermodynamic limit.

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