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

Details Spin polarized current of ferromagnetic one-dimensional electron gas in graphene armchair ribbons Spin polarized current of ferromagnetic one-dimensional electron gas in graphene armchair ribbons

2012-04-02

arxiv.org/abs/1204.0306v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 4 figures

Scientific paper

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.

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