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

C.R. Arroyo ; R. Frisenda ; Kasper Moth-Poulsen (Institutionen för kemi- och bioteknik, Polymerteknologi) ; J.S. Seldenthuis ; T. Bjørnholm ; H.S.J. van der Zant
Nanoscale Research Letters (1931-7573). Vol. 8 (2013),
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: Single-molecule transport, Quantum interference, Break junctions, Non-equilibrium Green’s functions

Denna post skapades 2013-05-27. Senast ändrad 2014-09-02.
CPL Pubid: 177417


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Institutioner (Chalmers)

Institutionen för kemi- och bioteknik, Polymerteknologi (2005-2014)



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Denna publikation är ett resultat av följande projekt:

ELectric Field control Over Spin molecules (ELFOS) (EC/FP7/270369)