Atomic carbon chains as spin-transmitters: An ab initio transport study

Joachim Alexander Fürst, Mads Brandbyge, Antti-Pekka Jauho

    Research output: Contribution to journalJournal articleResearchpeer-review

    Abstract

    An atomic carbon chain joining two graphene flakes was recently realized in a ground-breaking experiment by Jin et al. (Phys. Rev. Lett., 102 (2009) 205501). We present 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 p-states resonate with similar states in the strongly hybridized edges and chain. This effect should in general hold for any p-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.
    Original languageEnglish
    JournalEPL
    Volume91
    Issue number3
    Pages (from-to)37002
    ISSN0295-5075
    DOIs
    Publication statusPublished - 2010

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