Phys. Rev. Lett. 96, 136806 (2006) [4 pages]Landau-Level Splitting in Graphene in High Magnetic FieldsReceived 1 January 2006; published 6 April 2006 The quantum Hall (QH) effect in two-dimensional electrons and holes in high quality graphene samples is studied in strong magnetic fields up to 45 T. QH plateaus at filling factors ν=0,±1,±4 are discovered at magnetic fields B>20 T, indicating the lifting of the fourfold degeneracy of the previously observed QH states at ν=±4(|n|+1/2), where n is the Landau-level index. In particular, the presence of the ν=0,±1 QH plateaus indicates that the Landau level at the charge neutral Dirac point splits into four sublevels, lifting sublattice and spin degeneracy. The QH effect at ν=±4 is investigated in a tilted magnetic field and can be attributed to lifting of the spin degeneracy of the n=1 Landau level. © 2006 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.96.136806
DOI:
10.1103/PhysRevLett.96.136806
PACS:
73.63.−b, 73.21.−b, 73.43.−f
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