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

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. Bryce () and Colin J. Lambert ()
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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
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

Nature Communications, 2015, vol. 6, issue 1, 1-8

Abstract: 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.

Date: 2015
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DOI: 10.1038/ncomms7389

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