Quantum Hall Ferromagnetism in Graphene
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- 28 June 2006
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 96 (25), 256602
- https://doi.org/10.1103/physrevlett.96.256602
Abstract
Graphene is a two-dimensional carbon material with a honeycomb lattice and Dirac-like low-energy excitations. When Zeeman and spin-orbit interactions are neglected, its Landau levels are fourfold degenerate, explaining the separation between quantized Hall conductivity values seen in recent experiments. In this Letter we derive a criterion for the occurrence of interaction-driven quantum Hall effects near intermediate integer values of due to charge gaps in broken symmetry states.
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