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The puzzle of recently observed insulating phase of graphene at fillingfactor $\nu=0$ in high magnetic field quantum Hall (QH) experiments isinvestigated. We show that the magnetic field driven Peierls-type latticedistortion (due to the Landau level degeneracy) and random bond fluctuationscompete with each other, resulting in a transition from a QH-metal state atrelative low field to a QH-insulator state at high enough field at $\nu=0$. Thecritical field that separates QH-metal from QH-insulator depends on the bondfluctuation. The picture explains well why the field required for observing theinsulating phase is lower for a cleaner sample.

Topological Transition of Graphene from Quantum Hall Metal to Quantum Hall Insulator at $\nu=0$