Landau Level Splitting in Graphene in High Magnetic Fields

Abstract

The quantum Hall (QH) effect in two-dimensional (2D) electrons and holes in high quality graphene samples is studied in strong magnetic fields up to 45 T. QH plateaus at filling factors $\nu =0,\pm 1,\pm 4$ are discovered at magnetic fields $B>$20 T, indicating the lifting of the four-fold degeneracy of the previously observed QH states at $\nu =\pm (|n|+1/2)$, where $n$ is the Landau level index. In particular, the presence of the $\nu =0,\pm 1$ 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 $\nu =\pm 4$ is investigated in tilted magnetic field and can be attributed to lifting of the spin-degeneracy of the $n=1$ Landau level.

11 pages including 4 figures, to appear in PRL

References in corpus (4)

• Two Dimensional Atomic Crystals
• Unconventional Integer Quantum Hall effect in graphene
• Valley splitting of AlAs two-dimensional electrons in a perpendicular magnetic field
• Observation of Quantum Hall Valley Skyrmions

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