Topology induced Kondo effect in hydrogenated Pt nanocontacts

Details Topology induced Kondo effect in hydrogenated Pt nanocontacts Topology induced Kondo effect in hydrogenated Pt nanocontacts

2004-06-24

arxiv.org/abs/cond-mat/0406597v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 5 figures, submitted to phys. rev. lett

Scientific paper

10.1103/PhysRevB.71.241405

It is shown that recent experimental data on electronic transport through Pt nanocontacts in the presence of hydrogen admit an explanation in terms of topological and electron-electron correlation grounds. A model Hamiltonian, which incorporates two orbitals on Pt atoms, a single orbital on hydrogens, and the on-site Coulomb repulsion on the H atoms, is solved exactly, and connected to Pt leads described by a Bethe lattice. When two weakly coupled H atoms are placed between the Pt electrodes transversally to the transport direction (as recently suggested) a Kondo effect related to the symmetry of the Pt-H couplings, stabilizes the conductance around one quantum with a single channel contributing to the current, in agreement with the experiments.

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