Published January 1, 2016 | Version v1
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Magnetic phases of graphene nanoribbons under potential fluctuations

  • 1. IZTECH, Izmir Inst Technol, Dept Phys, TR-35430 Izmir, Turkey

Description

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.

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