  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 non-scaling behaviors observed
in recent experiments on quantum-Hall-liquid-to-insulator transition.
