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

Manrique, David Zsolt and Huang, Cancan and Baghernejad, Masoud and Zhao, Xiaotao and Al-owaedi, Oday A. and Sadeghi, Hatef and Kaliginedi, Veerabhadrarao and Hong, Wenjing and Gulcur, Murat and Wandlowski, Thomas and Bryce, Martin R. and Lambert, Colin J. (2015) A quantum circuit rule for interference effects in single-molecule electrical junctions. Nature Communications, 6: 6389. ISSN 2041-1723

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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.

Item Type:
Journal Article
Journal or Publication Title:
Nature Communications
Uncontrolled Keywords:
?? general biochemistry,genetics and molecular biologygeneral chemistrygeneral physics and astronomybiochemistry, genetics and molecular biology(all)chemistry(all)physics and astronomy(all) ??
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Deposited On:
05 Mar 2015 09:42
Last Modified:
16 Jul 2024 09:41