Graphene-based electronic spin lenses

Details Graphene-based electronic spin lenses Graphene-based electronic spin lenses

2010-09-05

arxiv.org/abs/1009.0904v1

Phys. Rev. Lett. 105, 146803 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

4 pages, 3 figures, accepted for publication in Phys. Rev. Lett

Scientific paper

We theoretically demonstrate the capability of a ferromagnetic-normal (FN) interface in graphene to focus an electron-wave with a certain spin direction. The essential feature is the negative refraction Klein tunneling, which is spin-resolved when the exchange energy of F graphene exceeds its Fermi energy. Exploiting this property, we propose a graphene NFN electronic spin lens through which an unpolarized electronic beam can be collimated with a finite spin-polarization. Our study reveals that magnetic graphene has the potential to be the electronic counterpart of the recently discovered photonic chiral meta-materials that exhibit a negative refractive index for only one direction of the circular polarization of the photon-wave.

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