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Breakdown of the N=0 quantum Hall state in graphene: Two insulating regimes

L. Zhang, J. Camacho, H. Cao, Y. P. Chen, M. Khodas, D. E. Kharzeev, A. M. Tsvelik, T. Valla, and I. A. Zaliznyak
Phys. Rev. B 80, 241412(R) – Published 23 December 2009

Abstract

We studied the unusual quantum Hall effect (QHE) near the charge neutrality point in high-mobility graphene sample for magnetic fields up to 18 T. We observe breakdown of the delocalized QHE transport and strong increase in resistivities ρxx,|ρxy| with decreasing Landau-level filling for ν<2, where we identify two insulating regimes. First, ρxx,xy increases nearly exponentially within the range of several resistance quanta RK, while the Hall effect gradually disappears and the off-diagonal resistivity ρxy eventually becomes independent of the direction of magnetic field, consistent with the Hall insulator with local transport. Then, at a filling ν1/2, there is a cusp in ρxx(ν) and an onset of even faster growth with the decreasing ν, indicating transition to a collective insulator state. A likely candidate for this state is a pinned Wigner crystal.

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  • Received 13 April 2009

DOI:https://doi.org/10.1103/PhysRevB.80.241412

©2009 American Physical Society

Authors & Affiliations

L. Zhang1, J. Camacho1, H. Cao2, Y. P. Chen2, M. Khodas1,3, D. E. Kharzeev3, A. M. Tsvelik1, T. Valla1, and I. A. Zaliznyak1,*

  • 1CMPMSD, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 2Department of Physics, Purdue University, West Lafayette, Indiana 47907, USA
  • 3Physics Department, Brookhaven National Laboratory, Upton, New York 11973, USA

  • *Corresponding author; zaliznyak@bnl.gov

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Issue

Vol. 80, Iss. 24 — 15 December 2009

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