Site determination and thermally assisted tunneling in homogenous nucleation

Details Site determination and thermally assisted tunneling in homogenous nucleation Site determination and thermally assisted tunneling in homogenous nucleation

2003-09-11

arxiv.org/abs/cond-mat/0309288v1

Phys. Rev. Lett. 91, 206102 (2003)

Physics

Condensed Matter

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.91.206102

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 stable fcc as well as the metastable hcp site. In fact the dimer fcc-hcp configuration was found to be only 1.3 meV less favorable with respect to the fcc-fcc configuration. This enables a confined intra-cell dimer motion, which at temperatures below 5 K is dominated by thermally assisted tunneling.

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