Flat-band ferromagnetism in armchair graphene nanoribbons
arXiv:0901.4387 · doi:10.1088/1742-6596/150/4/042110
Abstract
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.
arXiv comment4 pages, 2 figures
References in corpus (6)
- Electric Field Effect in Atomically Thin Carbon Films
- Energy Band Gap Engineering of Graphene Nanoribbons
- Half-Metallic Graphene Nanoribbons
- Room Temperature All Semiconducting sub-10nm Graphene Nanoribbon Field-Effect Transistors
- From Nagaoka's ferromagnetism to flat-band ferromagnetism and beyond: An introduction to ferromagnetism in the Hubbard model
- Ferromagnetism in the Hubbard Model-- Examples from Models with Degenerate Single-Electron Ground States