Ferromagnetism in armchair graphene nanoribbon

Details Ferromagnetism in armchair graphene nanoribbon Ferromagnetism in armchair graphene nanoribbon

2009-01-27

arxiv.org/abs/0901.4177v1

Phys. Rev. B 79, 035405 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevB.79.035405

Due to the weak spin-orbit interaction and the peculiar relativistic dispersion in graphene, there are exciting proposals to build spin qubits in graphene nanoribbons with armchair boundaries. However, the mutual interactions between electrons are neglected in most studies so far and thus motivate us to investigate the role of electronic correlations in armchair graphene nanoribbon by both analytical and numerical methods. Here we show that the inclusion of mutual repulsions leads to drastic changes and the ground state turns ferromagnetic in a range of carrier concentrations. Our findings highlight the crucial importance of the electron-electron interaction and its subtle interplay with boundary topology in graphene nanoribbons. Furthermore, since the ferromagnetic properties sensitively depends on the carrier concentration, it can be manipulated at ease by electric gates. The resultant ferromagnetic state with metallic conductivity is not only surprising from an academic viewpoint, but also has potential applications in spintronics at nanoscale.

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