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Nature Research, Nature Communications, 1(6), 2015

DOI: 10.1038/ncomms7389

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

Journal article published in 2015 by David Zsolt Manrique, Cancan Huang, Masoud Baghernejad ORCID, Xiaotao Zhao, Oday A. Al-Owaedi, Hatef Sadeghi ORCID, Veerabhadrarao Kaliginedi ORCID, Wenjing Hong, Murat Gulcur ORCID, Thomas Wandlowski, Martin R. Bryce, Colin J. Lambert,
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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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.