title: Vibration-induced Kondo tunneling through metal-organic complexes with even electron occupation number.
abstract: 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.
authors.affiliation: Physics Department, Ben-Gurion University of the Negev, Beer-Sheva, Israel.
authors.forename: K
authors.initials: K
authors.lastname: Kikoin
authors.forename: M N
authors.initials: MN
authors.lastname: Kiselev
authors.forename: M R
authors.initials: MR
authors.lastname: Wegewijs