Carrier density and magnetism in graphene zigzag nanoribbons
- 25 June 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 79 (23), 235433
- https://doi.org/10.1103/physrevb.79.235433
Abstract
The influence of carrier density on magnetism in a zigzag graphene nanoribbon is studied in a -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.
Keywords
Other Versions
This publication has 47 references indexed in Scilit:
- Theory of Interedge Superexchange in Zigzag Edge MagnetismPhysical Review Letters, 2009
- Unscreened Coulomb Interactions and the Quantum Spin Hall Phase in Neutral Zigzag Graphene RibbonsPhysical Review Letters, 2008
- Prediction of very large values of magnetoresistance in a graphene nanoribbon deviceNature Nanotechnology, 2008
- Vacancy-induced magnetism in graphene and graphene ribbonsPhysical Review B, 2008
- Graphene: Exploring carbon flatlandPhysics Today, 2007
- Energy Band-Gap Engineering of Graphene NanoribbonsPhysical Review Letters, 2007
- Energy Gaps in Graphene NanoribbonsPhysical Review Letters, 2006
- Peculiar width dependence of the electronic properties of carbon nanoribbonsPhysical Review B, 2006
- Magnetic ordering at the edges of graphitic fragments: Magnetic tail interactions between the edge-localized statesPhysical Review B, 2005
- Ground-state properties of nanographite systems with zigzag edgesPhysical Review B, 2003