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Phys Rev Lett. 2001 Nov 19;87(21):216802. Epub 2001 Nov 1.

Metallic phase in quantum Hall systems due to inter-Landau-band mixing.

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Physics Department, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.


The electronic eigenstates of a quantum Hall (QH) system are chiral states. Strong inter-Landau-band mixings among these states can occur when the bandwidth is comparable to the spacing of two adjacent Landau bands. We show that mixing of localized states with opposite chirality can delocalize electronic states. Based on numerical results, we propose the existence of a metallic phase between two adjacent QH phases and between a QH phase and the insulating phase. This result is consistent with nonscaling behaviors observed in recent experiments on a quantum Hall liquid-to-insulator transition.

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