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Phys. Rev. Lett. 99, 106802 (2007) [4 pages]

Quantum Hall States near the Charge-Neutral Dirac Point in Graphene

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Z. Jiang1,2,*, Y. Zhang1,†, H. L. Stormer1,3,4, and P. Kim1
1Department of Physics, Columbia University, New York, New York 10027, USA
2National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
3Department of Applied Physics and Applied Mathematics, Columbia University, New York, New York 10027, USA
4Bell Laboratories, Alcatel-Lucent, Murray Hill, New Jersey 07974, USA

Received 6 May 2007; published 6 September 2007

We investigate the quantum Hall (QH) states near the charge-neutral Dirac point of a high mobility graphene sample in high magnetic fields. We find that the QH states at filling factors ν=±1 depend only on the perpendicular component of the field with respect to the graphene plane, indicating that they are not spin related. A nonlinear magnetic field dependence of the activation energy gap at filling factor ν=1 suggests a many-body origin. We therefore propose that the ν=0 and ±1 states arise from the lifting of the spin and sublattice degeneracy of the n=0 Landau level, respectively.

© 2007 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.99.106802
DOI:
10.1103/PhysRevLett.99.106802
PACS:
73.63.−b, 73.21.−b, 73.43.−f

*jiang@magnet.fsu.edu

†Present address: Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA.

 
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