Zero-energy state in graphene in a high magnetic field |
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Authors: | Checkelsky Joseph G Li Lu Ong N P |
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Institution: | Department of Physics, Princeton University, Princeton, New Jersey 08544, USA. |
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Abstract: | The fate of the charge-neutral Dirac point in graphene in a high magnetic field H has been investigated at low temperatures (T approximately 0.3 K). In samples with small gate-voltage offset V0, the resistance R0 at the Dirac point diverges steeply with H, signaling a crossover to a state with a very large R0. The approach to this 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 gapless charge-carrying excitations. |
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