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

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Author Manrique David Zsolt, Huang Cancan, Baghernejad Masoud, Zhao Xiaotao, Al-Owaedi Oday A, Sadeghi Hatef, Kaliginedi Veerabhadrarao, Hong Wenjing, Gulcur Murat, Wandlowski Thomas, Bryce Martin R, Lambert Colin J,
Project Electron Transport at the Nanoscale - An Electrochemical Approach II
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Original article (peer-reviewed)

Journal Nature communications
Volume (Issue) 6
Page(s) 6389 - 6389
Title of proceedings Nature communications
DOI 10.1038/ncomms7389

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.
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