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A quantum circuit rule for interference effects in single-molecule electrical junctions

Author

Listed:
  • David Zsolt Manrique

    (Lancaster University)

  • Cancan Huang

    (University of Bern)

  • Masoud Baghernejad

    (University of Bern)

  • Xiaotao Zhao

    (Durham University)

  • Oday A. Al-Owaedi

    (Lancaster University
    Woman College of Science, University of Babylon, Iraq)

  • Hatef Sadeghi

    (Lancaster University)

  • Veerabhadrarao Kaliginedi

    (University of Bern)

  • Wenjing Hong

    (University of Bern)

  • Murat Gulcur

    (Durham University)

  • Thomas Wandlowski

    (University of Bern)

  • Martin R. Bryce

    (Durham University)

  • Colin J. Lambert

    (Lancaster University)

Abstract

A quantum circuit rule for combining quantum interference effects in the conductive properties of oligo(phenyleneethynylene) (OPE)-type molecules possessing three aromatic rings was investigated both experimentally and theoretically. Molecules were of the type X-Y-X, where X represents pyridyl anchors with para (p), meta (m) or ortho (o) connectivities and Y represents a phenyl ring with p and m connectivities. The conductances GXmX (GXpX) of molecules of the form X-m-X (X-p-X), with meta (para) connections in the central ring, were predominantly lower (higher), irrespective of the meta, para or ortho nature of the anchor groups X, demonstrating that conductance is dominated by the nature of quantum interference in the central ring Y. The single-molecule conductances were found to satisfy the quantum circuit rule Gppp/Gpmp=Gmpm/Gmmm. This demonstrates that the contribution to the conductance from the central ring is independent of the para versus meta nature of the anchor groups.

Suggested Citation

  • David Zsolt Manrique & Cancan Huang & Masoud Baghernejad & Xiaotao Zhao & Oday A. Al-Owaedi & Hatef Sadeghi & Veerabhadrarao Kaliginedi & Wenjing Hong & Murat Gulcur & Thomas Wandlowski & Martin R. Br, 2015. "A quantum circuit rule for interference effects in single-molecule electrical junctions," Nature Communications, Nature, vol. 6(1), pages 1-8, May.
    • Handle: RePEc:nat:natcom:v:6:y:2015:i:1:d:10.1038_ncomms7389
    DOI: 10.1038/ncomms7389
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