Vibration-induced Kondo tunneling through metal-organic complexes with even electron occupation number

Details Vibration-induced Kondo tunneling through metal-organic complexes with even electron occupation number Vibration-induced Kondo tunneling through metal-organic complexes with even electron occupation number

2005-11-15

arxiv.org/abs/cond-mat/0511369v1

Phys. Rev. Lett. 96, 176801 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 eps figures

Scientific paper

10.1103/PhysRevLett.96.176801

We investigate transport through a mononuclear transition-metal complex with strong tunnel coupling to two electrodes. The ground state of this molecule is a singlet while the first excited state is a triplet. We show that a modulation of the tunnel-barrier due to a molecular distortion which couples to the tunneling induces a Kondo-effect, provided the discrete vibrational energy compensates the singlet/triplet gap. We discuss the single-phonon and two-phonon assisted co-tunneling and possible experimental realization of the theory.

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