The zero-energy state in graphene in a high magnetic field
Abstract
The fate of the charge-neutral Dirac point in graphene in a high magnetic field H has been investigated at low temperatures (T 0.3 K). In samples with small V0 (the gate voltage needed to access the Dirac point), the resistance R0 at the Dirac point diverges steeply with H, signalling a crossover to an insulating state in intense field. The approach to the insulating state is highly unusual. Despite the steep divergence in R0, the profile of R0 vs. T in fixed H saturates to a T-independent value below 2 K, consistent with charge carrying gapless excitations.
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