1204.0306 (S. C. Kim et al.)

Spin polarized current of ferromagnetic one-dimensional electron gas in
graphene armchair ribbons    [PDF]

S. C. Kim, J. W. Lee, W. -R. Eric Yang

We propose that a spin-polarized current can emerge naturally from ferromagnetic graphene armchair ribbons. When only the lowest conduction subband is occupied in graphene armchair ribbons spin-polarized ferromagnetic state can be stable. This is due to the unusually large many-body exchange self-energy of one-dimensional electron gas in a graphene armchair ribbon. We find that ferromagnetic state can be stable for ribbon widths $L_x=3Ma_0$ while paramagnetic state is stable for $L_x=(3M+1)a_0$, where $M$ is an integer and $a_{0}$ is the length of the unit cell.

View original: http://arxiv.org/abs/1204.0306