Phase space for the breakdown of the quantum Hall effect in epitaxial graphene.

  title={Phase space for the breakdown of the quantum Hall effect in epitaxial graphene.},
  author={Jack A. Alexander-Webber and A. M. R. Baker and T. J. B. M. Janssen and Alexander Tzalenchuk and Samuel Lara‐Avila and Sergey E. Kubatkin and R. Yakimova and Benjamin A. Piot and Duncan Kennedy Maude and Robin J. Nicholas},
  journal={Physical Review Letters},
We report the phase space defined by the quantum Hall effect breakdown in polymer gated epitaxial graphene on SiC (SiC/G) as a function of temperature, current, carrier density, and magnetic fields up to 30 T. At 2 K, breakdown currents (I-c) almost 2 orders of magnitude greater than in GaAs devices are observed. The phase boundary of the dissipationless state (rho(xx) = 0) shows a [1 - (T/T-c)(2)] dependence and persists up to T-c > 45 K at 29 T. With magnetic field Ic was found to increase… 

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