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. 2006 Apr 7;96(13):136806.
doi: 10.1103/PhysRevLett.96.136806. Epub 2006 Apr 6.

Landau-level splitting in graphene in high magnetic fields

Y Zhang  1 , Z Jiang, J P Small, M S Purewal, Y-W Tan, M Fazlollahi, J D Chudow, J A Jaszczak, H L Stormer, P Kim
Affiliations

Landau-level splitting in graphene in high magnetic fields

Y Zhang et al. Phys Rev Lett. .

Abstract

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 nu = 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 nu = +/-4(absolute value(n) + 1/2), where n is the Landau-level index. In particular, the presence of the nu = 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 nu = +/-4 is investigated in a tilted magnetic field and can be attributed to lifting of the spin degeneracy of the n = 1 Landau level.

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