Phys. Rev. Lett. 91, 206102 (2003) [4 pages]Site Determination and Thermally Assisted Tunneling in Homogenous NucleationReceived 21 March 2003; revised 16 July 2003; published 12 November 2003 A combined low-temperature scanning tunneling microscopy and density functional theory study on the binding and diffusion of copper monomers, dimers, and trimers adsorbed on Cu(111) is presented. Whereas atoms in trimers are found in fcc sites only, monomers as well as atoms in dimers can occupy the fcc as well as the metastable hcp site. In fact the dimer fcc-hcp configuration is only 1.3 meV less favorable with respect to the fcc-fcc configuration. This enables a confined intracell dimer motion, which at temperatures below 5 K is dominated by thermally assisted tunneling. © 2003 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.91.206102
DOI:
10.1103/PhysRevLett.91.206102
PACS:
68.35.Fx, 68.37.–d, 68.55.–a
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