Carrier Density and Magnetism in Graphene Zigzag Nanoribbons

Details Carrier Density and Magnetism in Graphene Zigzag Nanoribbons Carrier Density and Magnetism in Graphene Zigzag Nanoribbons

2009-04-15

arxiv.org/abs/0904.2396v2

Phys. Rev. B 79, 235433 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

5 pages, 5 figures

Scientific paper

10.1103/PhysRevB.79.235433

The influence of carrier density on magnetism in a zigzag graphene nanoribbon is studied in a $\pi$-orbital Hubbard-model mean-field approximation. Departures from half-filling alter the magnetism, leading to states with charge density variation across the ribbon and parallel spin-alignment on opposite edges. Finite carrier densities cause the spin-density near the edges to decrease steadily, leading eventually to the absence of magnetism. At low doping densities the system shows a tendency to multiferroic order in which edge charges and spins are simultaneously polarized.

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