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- W2070036668 abstract "Single vacancies within the dense $3mathrm{O}(2ifmmodetimeselsetexttimesfi{}2)/mathrm{Ru}(001)$ layer are found to display highly directional diffusion characteristics that leads to a self-trapping of this quasiparticle to within three neighboring sites. While a high mobility within these few sites is found, vacancy diffusion across the surface is very slow (ratio $>1000:1).$ The nonzero motion of the entire triangular unit proceeds in the usual stochastical way and demonstrates that intrinsic structural defects of the substrate lattice are not involved in the self-trapping process. It is demonstrated that the observed motional constraint is due to the local symmetry of the oxygen adsorption sites, which implies a directional dependence of diffusion barriers for vacancy motion within the $(2ifmmodetimeselsetexttimesfi{}2)$ unit cell." @default.
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- W2070036668 date "1999-05-15" @default.
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- W2070036668 title "Directional preference in particle motion: Self-trapping of vacancies in an ordered adsorbate layer" @default.
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- W2070036668 doi "https://doi.org/10.1103/physrevb.59.13285" @default.
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