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Anomalous Interaction Dependence in Magnetism of Graphene Nanoribbons with Zigzag Edges

被引：1
|
作者：
Furukawa, Karin [1 ]
Yoshioka, Hideo [1 ]
Mochizuki, Yoneko [1 ]
机构：
[1] Nara Womens Univ, Dept Phys, Nara 6308506, Japan
来源：
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN | 2010年 / 79卷 / 08期
关键词：
graphene nanoribbon; zigzag-shaped edges; edge states; magnetism; NANOGRAPHITE RIBBONS; GRAPHITIC RIBBONS; STATES;
D O I：
10.1143/JPSJ.79.084708
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
The properties in magnetic ordered states of graphene nanoribbons with zigzag-shaped edges are investigated by applying mean-field approximation to the Hubbard model with the on-site repulsion U. We observe that magnetic moments and critical temperature show anomalous power-law dependences as a function of U; the actual values of the power are determined by only the width of the ribbons. Such singular behaviours are found to be due to the localized nature of the electronic states close to the Fermi energy.
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页数：6
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