Interaction of a CO molecule with a Pt monatomic wire: Electronic structure and ballistic conductance

Gabriele Sclauzero, Andrea Dal Corso, Alexander Smogunov, and Erio Tosatti
Phys. Rev. B 78, 085421 – Published 18 August 2008

Abstract

We carry out a first-principles density-functional study of the interaction between a monatomic Pt wire and a CO molecule, comparing the energies of different adsorption configurations (bridge, on top, substitutional, and tilted bridge) and discussing the effects of spin-orbit (SO) coupling on the electronic structure and on the ballistic conductance of two of these systems (bridge and substitutional). We find that when the wire is unstrained, the bridge configuration is energetically favored, while the substitutional geometry becomes possible only after the breaking of the Pt-Pt bond next to CO. The interaction can be described by a donation/backdonation process similar to that occurring when CO adsorbs on transition-metal surfaces, a picture which remains valid also in the presence of SO coupling. The ballistic conductance of the (tipless) nanowire is not much reduced by the adsorption of the molecule on the bridge and on-top sites. However, it shows a significant drop in the substitutional case. The differences in the electronic structure due to the SO coupling influence the transmission only at energies far away from the Fermi level so that fully and scalar-relativistic conductances do not differ significantly.

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  • Received 11 June 2008

DOI:https://doi.org/10.1103/PhysRevB.78.085421

©2008 American Physical Society

Authors & Affiliations

Gabriele Sclauzero1,2, Andrea Dal Corso1,3, Alexander Smogunov2,3,4, and Erio Tosatti1,2,3

  • 1International School for Advanced Studies (SISSA-ISAS), Via Beirut 2-4, IT-34014 Trieste, Italy
  • 2CNR-INFM Democritos, Via Beirut 2-4, IT-34014 Trieste, Italy
  • 3International Centre for Theoretical Physics (ICTP), Strada Costiera 11, IT-34014 Trieste, Italy
  • 4Voronezh State University, University Square 1, 394006 Voronezh, Russia

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Issue

Vol. 78, Iss. 8 — 15 August 2008

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