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

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 96卷 / 25期

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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