Quantum Hall ferromagnetism in graphene

被引:666
作者
Nomura, Kentaro [1 ]
MacDonald, Allan H. [1 ]
机构
[1] Univ Texas, Dept Phys, Austin, TX 78712 USA
关键词
D O I
10.1103/PhysRevLett.96.256602
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 4e(2)/h 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 e(2)/h due to charge gaps in broken symmetry states.
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