Orbital Kondo Effect in Cobalt-Benzene Sandwich Molecules

M. Karolak, D. Jacob, and A. I. Lichtenstein
Phys. Rev. Lett. 107, 146604 – Published 30 September 2011
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Abstract

We study a Co-benzene sandwich molecule bridging the tips of a Cu nanocontact as a realistic model of correlated molecular transport. To this end we employ a recently developed method for calculating the correlated electronic structure and transport properties of nanoscopic conductors. When the molecule is slightly compressed by the tips of the nanocontact the dynamic correlations originating from the strongly interacting Co 3d shell give rise to an orbital Kondo effect while the usual spin Kondo effect is suppressed due to Hund’s rule coupling. This nontrivial Kondo effect produces a sharp and temperature-dependent Abrikosov-Suhl resonance in the spectral function at the Fermi level and a corresponding Fano line shape in the low bias conductance.

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  • Received 24 May 2011

DOI:https://doi.org/10.1103/PhysRevLett.107.146604

© 2011 American Physical Society

Authors & Affiliations

M. Karolak1, D. Jacob2, and A. I. Lichtenstein1

  • 1I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstraße 9, D-20355 Hamburg, Germany
  • 2Max-Planck-Institut für Mikrostrukturphysik, Weinberg 2, 06120 Halle, Germany

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Issue

Vol. 107, Iss. 14 — 30 September 2011

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