Quantum Hall to Charge-Density-Wave Phase Transitions in$ ABC$-Trilayer Graphene

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Interacting Electrons and Quantum Magnetism

Assa Auerbach (1994)

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Quantum Hall Ferromagnetism in Graphene

Kentaro Nomura, Allan H. MacDonald (2006)

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Landau-level splitting in graphene in high magnetic fields.

Y. Zhang, Z. Jiang, J. Small … (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 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.