Vibration-induced Kondo tunneling through metal-organic complexes with even electron occupation number.
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 cotunneling and possible experimental realization of the theory.
Kikoin
K
K
Physics Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
Kiselev
M N
MN
Wegewijs
M R
MR