Localized magnetic states in biased bilayer and trilayer graphene

Details Localized magnetic states in biased bilayer and trilayer graphene Localized magnetic states in biased bilayer and trilayer graphene

2008-11-21

arxiv.org/abs/0811.3489v2

J. Phys.: Condens. Matter 21 (2009) 182002

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

16 pages,6 figures

Scientific paper

10.1088/0953-8984/21/18/182002

We study the localized magnetic states of impurity in biased bilayer and trilayer graphene. It is found that the magnetic boundary for bilayer and trilayer graphene presents the mixing features of Dirac and conventional fermion. For zero gate bias, as the impurity energy approaches the Dirac point, the impurity magnetization region diminishes for bilayer and trilayer graphene. When a gate bias is applied, the dependence of impurity magnetic states on the impurity energy exhibits a different behavior for bilayer and trilayer graphene due to the opening of a gap between the valence and the conduction band in the bilayer graphene with the gate bias applied. The magnetic moment and the corresponding magnetic transition of the impurity in bilayer graphene are also investigated.

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