Flat-band ferromagnetism in armchair graphene nanoribbons

Details Flat-band ferromagnetism in armchair graphene nanoribbons Flat-band ferromagnetism in armchair graphene nanoribbons

2009-01-28

arxiv.org/abs/0901.4387v1

Journal of Physics: Conference Series 150 (2009) 042110

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 2 figures

Scientific paper

10.1088/1742-6596/150/4/042110

We study the electronic correlation effects in armchair graphene nanoribbons that have been recently proposed to be the building blocks of spin qubits. The armchair edges give rise to peculiar quantum interferences and lead to quenched kinetic energy of the itinerant carriers at appropriate doping level. This is a beautiful one-dimensional analogy of the Landau-level formation in two dimensions except the magnetic field is not needed here. Combining the techniques of effective field theory and variational wave function approach, we found that the ground state exhibits a new type of flat-band ferromagnetism that hasn't been found before. At the end, we address practical issues about realization of this novel magnetic state in experiments.

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