Orbital Kondo effect in Cobalt-Benzene sandwich molecules

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 non-trivial 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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• Towards a full ab initio theory of strong electronic correlations in nanoscale devices
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• Shifting the Voltage Drop in Electron Transport through a Single Molecule
• Predicting the conductance of strongly correlated molecules: the Kondo effect in perchlorotriphenylmethyl/Au junctions
• Many-body localized molecular orbital approach to molecular transport
• Coulomb blockade and Kondo effect in the electronic structure of Hubbard molecules connected to metallic leads: a finite-temperature exact-diagonalization study
• Simulation of inelastic spin flip excitations and Kondo effect in STM spectroscopy of magnetic molecules on metal substrates
• Phonon-assisted thermoelectric effects in a two-level molecule
• Co(CO)n/Cu(001): Towards understanding chemical control of the Kondo effect
• Effects of valence, geometry and electronic correlations on transport in transition metal benzene sandwich molecules
• On the origin of the quasi-particle peak in Cr(001) surfaces