Scaling of the quantum Hall plateau-plateau transition in graphene

We show that the width of the longitudinal magnetoconductivity peaks in graphene related to the N=1 Landau level displays a power-law type temperature dependence, Delta nu proportional to T-kappa, with kappa=0.37 +/- 0.05. Similarly, the derivative of the Hall conductivity at the plateau transition, (d sigma(xy)/d nu), scales as T-kappa with kappa=0.41 +/- 0.04 for both the first and second Landau levels of electrons and holes. These results confirm the universality of a critical quantum Hall scaling in the higher Landau levels of graphene. In the zeroth Landau level, however, Delta nu and d sigma(xy)/d nu are essentially temperature independent, pointing toward a different type of scaling that is possibly governed by a temperature independent intrinsic length.