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Quantum-Interference-Controlled Molecular Electronics

Author(s):

San-Huang Ke, Weitao Yang, Harold U. Baranger

Journal:

Nano Letters

Year:

2008

Volume:

8

Pages

3257–3261

DOI:

10.1021/nl8016175

Abstract:

Quantum interference in coherent transport through single molecular rings may provide a mechanism to control the current in molecular electronics. We investigate its applicability, using a single-particle Green function method combined with ab initio electronic structure calculations. We find that the quantum interference effect (QIE) is strongly dependent on the interaction between molecular π-states and contact σ-states. It is masked by σ tunneling in small molecular rings with Au leads, such as benzene, due to strong π−σ hybridization, while it is preserved in large rings, such as [18]annulene, which then could be used to realize quantum interference effect (QIE) transistors.

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