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Title

Quantum interference in single-molecule electronic systems

AuthorsSparks, R. E.; García-Suárez, Víctor M. ; Manrique, D. Zs.; Lambert, Colin J.
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review B 83(7): 075437 (2011)
AbstractWe present a general analytical formula and an ab initio study of quantum interference in multibranch molecules. Ab initio calculations are used to investigate quantum interference in a benzene-1,2-dithiolate (BDT) molecule sandwiched between gold electrodes and through oligoynes of various lengths. We show that when a point charge is located in the plane of a BDT molecule and its position varied, the electrical conductance exhibits a clear interference effect, whereas when the charge approaches a BDT molecule along a line normal to the plane of the molecule and passing through the center of the phenyl ring, interference effects are negligible. In the case of oligoynes, quantum interference leads to the appearance of a critical energy Ec at which the electron transmission coefficient T(E) of chains with even or odd numbers of atoms is independent of length. To illustrate the underlying physics, we derive a general analytical formula for electron transport through multibranch structures and demonstrate the versatility of the formula by comparing it with the above ab initio simulations. We also employ the analytical formula to investigate the current inside the molecule and demonstrate that large countercurrents can occur within a ringlike molecule such as BDT, when the point charge is located in the plane of the molecule. The formula can be used to describe quantum interference and Fano resonances in structures with branches containing arbitrary elastic scattering regions connecting nodal sites.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevB.83.075437
URIhttp://hdl.handle.net/10261/50430
DOI10.1103/PhysRevB.83.075437
Identifiersdoi: 10.1103/PhysRevB.83.075437
issn: 0163-1829
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