A quantum circuit rule for interference effects in single-molecule electrical junctions.
- Manrique DZ Department of Physics, Lancaster University, Lancaster LA1 4YB, UK.
- Huang C Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012, Switzerland.
- Baghernejad M Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012, Switzerland.
- Zhao X Department of Chemistry, Durham University, Durham DH1 3LE, UK.
- Al-Owaedi OA 1] Department of Physics, Lancaster University, Lancaster LA1 4YB, UK [2] Department of Laser Physics, Woman College of Science, University of Babylon, Iraq.
- Sadeghi H Department of Physics, Lancaster University, Lancaster LA1 4YB, UK.
- Kaliginedi V Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012, Switzerland.
- Hong W Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012, Switzerland.
- Gulcur M Department of Chemistry, Durham University, Durham DH1 3LE, UK.
- Wandlowski T Department of Chemistry and Biochemistry, University of Bern, Freiestrasse 3, Bern CH-3012, Switzerland.
- Bryce MR Department of Chemistry, Durham University, Durham DH1 3LE, UK.
- Lambert CJ Department of Physics, Lancaster University, Lancaster LA1 4YB, UK.
- 2015-03-04
Published in:
- Nature communications. - 2015
English
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.
- Language
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- English
- Open access status
- gold
- Identifiers
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- DOI 10.1038/ncomms7389
- PMID 25731608
- Persistent URL
- https://sonar.ch/global/documents/156761
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