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.
- Received 4 April 2006
DOI:https://doi.org/10.1103/PhysRevLett.96.256602
©2006 American Physical Society