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It is shown that recent experimental data on electronic transport through Ptnanocontacts in the presence of hydrogen admit an explanation in terms oftopological and electron-electron correlation grounds. A model Hamiltonian,which incorporates two orbitals on Pt atoms, a single orbital on hydrogens, andthe on-site Coulomb repulsion on the H atoms, is solved exactly, and connectedto Pt leads described by a Bethe lattice. When two weakly coupled H atoms areplaced between the Pt electrodes transversally to the transport direction (asrecently suggested) a Kondo effect related to the symmetry of the Pt-Hcouplings, stabilizes the conductance around one quantum with a single channelcontributing to the current, in agreement with the experiments.Comment: 4 pages, 5 figures, submitted to phys. rev. let

Topology-induced many body effects in hydrogenated Pt nanocontacts