The zero-energy state in graphene in a high magnetic field

Details The zero-energy state in graphene in a high magnetic field The zero-energy state in graphene in a high magnetic field

2007-08-14

arxiv.org/abs/0708.1959v2

Phys. Rev. Lett. 100, 206801 (2008)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures. Four new sub-figures have been added. Text expanded to discuss data from more samples

Scientific paper

10.1103/PhysRevLett.100.206801

The fate of the charge-neutral Dirac point in graphene in a high magnetic field $H$ has been investigated at low temperatures ($T\sim$ 0.3 K). In samples with small $V_0$ (the gate voltage needed to access the Dirac point), the resistance $R_0$ 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 $R_0$, the profile of $R_0$ vs. $T$ in fixed $H$ saturates to a $T$-independent value below 2 K, consistent with charge carrying gapless excitations.

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