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

Research output: Contribution to journalArticleScientificpeer-review

Researchers

  • Joachim A. Fürst
  • M. Brandbyge
  • A. P. Jauho

Research units

  • Technical University of Denmark

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 πz bands, and the chain states. Transmission occurs when the graphene π-states resonate with similar states in the strongly hybridized edges and chain. This effect should in general hold for any π-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.

Details

Original languageEnglish
Article number37002
JournalEPL
Volume91
Issue number3
Publication statusPublished - Aug 2010
MoE publication typeA1 Journal article-refereed

ID: 13557364