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Symmetry Breaking in the Zero-Energy Landau Level in Bilayer Graphene

Y. Zhao, P. Cadden-Zimansky, Z. Jiang, and P. Kim
Phys. Rev. Lett. 104, 066801 – Published 8 February 2010
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Abstract

The quantum Hall effect near the charge neutrality point in bilayer graphene is investigated in high magnetic fields of up to 35 T using electronic transport measurements. In the high-field regime, the eightfold degeneracy in the zero-energy Landau level is completely lifted, exhibiting new quantum Hall states corresponding to filling factors ν=0, 1, 2, and 3. Measurements of the activation energy gaps for the ν=2 and 3 filling factors in tilted magnetic fields exhibit no appreciable dependence on the in-plane magnetic field, suggesting that these Landau level splittings are independent of spin. In addition, measurements taken at the ν=0 charge neutral point show that, similar to single layer graphene, the bilayer becomes insulating at high fields.

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  • Received 1 October 2009

DOI:https://doi.org/10.1103/PhysRevLett.104.066801

©2010 American Physical Society

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Going eight separate ways

Published 8 February 2010

A very high magnetic field splits the zero-energy Landau level of bilayer graphene revealing eight distinct levels.

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Authors & Affiliations

Y. Zhao1, P. Cadden-Zimansky1,2, Z. Jiang3, and P. Kim1

  • 1Department of Physics, Columbia University, New York, New York 10027, USA
  • 2National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 3School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332, USA

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Issue

Vol. 104, Iss. 6 — 12 February 2010

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