Atomic carbon chains as spin-transmitters: an \textit{Ab initio} transport study

Details Atomic carbon chains as spin-transmitters: an \textit{Ab initio} transport study Atomic carbon chains as spin-transmitters: an \textit{Ab initio} transport study

2009-09-09

arxiv.org/abs/0909.1756v2

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

An atomic carbon chain joining two graphene flakes was recently realized in a ground-breaking experiment by Jin {\it et al.}, Phys. Rev. Lett. {\bf 102}, 205501 (2009). We present {\it ab initio} results for the electron transport properties of such chains and demonstrate complete spin-polarization of the transmission in large energy ranges. The effect is due to the spin-polarized zig-zag edge terminating each graphene flake causing a spin-splitting of the graphene $\pi_z$ bands, and the chain states. Transmission occurs when the graphene $\pi$-states resonate with similar states in the strongly hybridized edges and chain. This effect should in general hold for any $\pi$-conjugated molecules bridging the zig-zag edges of graphene electrodes. The polarization of the transmission can be controlled by chemically or mechanically modifying the molecule, or by applying an electrical gate.

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