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Two-dimensional roughening of adsorbate islands in thermodynamic equilibrium

par Wintterlin, Joost;Trost, Johannes;Schuster, Rolf;Eichler, Andreas;McEwen, Jean-Sabin
Référence Physical Review Letters, 96, 16, page (166102)
Publication Publié, 2006-04-26

Article révisé par les pairs

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Résumé :

Equilibrium fluctuations of islands of adsorbed O atoms on Ru(0001) were investigated by scanning tunneling microscopy (STM), density functional theory calculations (DFT) and Monte Carlo (MC) simulations. Very ramified (2×2)-O islands were observed by high-speed STM that point to complex interactions between the O atoms. The DFT calculations show that, in addition to pairwise attractive interactions between third-nearest neighbors, a repulsive three-body interaction exists between these. MC simulations that include three-body interactions reproduce the observed ordering behavior.