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Open Access Nano Express

Quantum interference effects at room temperature in OPV-based single-molecule junctions

Carlos R Arroyo1*, Riccardo Frisenda1, Kasper Moth-Poulsen23, Johannes S Seldenthuis1, Thomas Bjørnholm2 and Herre SJ van der Zant1

Author Affiliations

1 Kavli Institute of Nanoscience, Delft University of Technology, Lorentzweg 1, Delft, 2628 CJ, The Netherlands

2 Nano-Science Center, Department of Chemistry, University of Copenhagen, Universitetsparken 5, Copenhagen, 2100, Denmark

3 Department of Chemical and Biological Engineering, Chalmers University of Technology, Gothenburg, 41296, Sweden

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Nanoscale Research Letters 2013, 8:234  doi:10.1186/1556-276X-8-234

Published: 16 May 2013

Abstract

Interference effects on charge transport through an individual molecule can lead to a notable modulation and suppression on its conductance. In this letter, we report the observation of quantum interference effects occurring at room temperature in single-molecule junctions based on oligo(3)-phenylenevinylene (OPV3) derivatives, in which the central benzene ring is coupled to either para- or meta-positions. Using the break-junction technique, we find that the conductance for a single meta-OPV3 molecule wired between gold electrodes is one order of magnitude smaller than that of a para-OPV3 molecule. Theoretical calculations confirm the occurrence of constructive and destructive interference in the para- and meta-OPV3 molecules respectively, which arises from the phase difference of the transmission coefficients through the molecular orbitals.

Keywords:
Single-molecule transport; Quantum interference; Break junctions; Non-equilibrium Green’s functions