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APS » Journals » Phys. Rev. Lett. » Volume 95 » Issue 25
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Phys. Rev. Lett. 95, 256803 (2005) [4 pages]

Kondo Resonances and Anomalous Gate Dependence in the Electrical Conductivity of Single-Molecule Transistors

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L. H. Yu1, Z. K. Keane1, J. W. Ciszek2, L. Cheng2, J. M. Tour2, T. Baruah4,5, M. R. Pederson4, and D. Natelson1,3
1Department of Physics and Astronomy, Rice University, 6100 Main Street, Houston, Texas 77005, USA
2Department of Chemistry and Center for Nanoscale Science and Technology, Rice University, 6100 Main Street, Houston, Texas 77005, USA
3Department of Electrical and Computer Engineering, Rice University, 6100 Main Street, Houston, Texas 77005, USA
4Center for Computational Materials Science, Code 6390-Naval Research Laboratory, Washington, DC 20375-5435, USA
5Department of Physics, SUNY, Stony Brook, New York 11794, USA

Received 27 May 2005; published 14 December 2005

We report Kondo resonances in the conduction of single-molecule transistors based on transition metal coordination complexes. We find Kondo temperatures in excess of 50 K, comparable to those in purely metallic systems. The observed gate dependence of the Kondo temperature is inconsistent with observations in semiconductor quantum dots and a simple single-dot-level model. We discuss possible explanations of this effect, in light of electronic structure calculations.

© 2005 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.95.256803
DOI:
10.1103/PhysRevLett.95.256803
PACS:
73.22.−f, 73.23.Hk, 85.65.+h
 
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