Magnetic phases of graphene nanoribbons under potential fluctuations

Article

关键词: EDGE;    RIBBONS;    STATE;   

DOI  :  10.1103/PhysRevB.93.014415

来源: SCIE

【 摘 要 】

We investigate the effects of long-range potential fluctuations and electron-electron interactions on the electronic and magnetic properties of graphene nanoribbons with zigzag edges using an extended mean-field Hubbard model. We show that electron-electron interactions make the edge states robust against potential fluctuations. When the disorder is strong enough, the presence of electron-hole puddles induces a magnetic phase transition from antiferromagnetically coupled edge states to ferromagnetic coupling, in agreement with recent experimental results.

【 授权许可】

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