G. Rossi

Publications (2)7.37 Total impact

• Source

  Available from: Tapio Ala-Nissila

  Article: Patterning of Heteroepitaxial Overlayers from Nano to Micron Scales

  K R Elder, G Rossi, P Kanerva, F Sanches, S-C Ying, E Granato, C V Achim, T Ala-Nissila
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  ABSTRACT: Thin heteroepitaxial overlayers have been proposed as templates to generate stable, self-organized nanostructures at large length scales, with a variety of important technological applications. However, modeling strain-driven self-organization is a formidable challenge due to different length scales involved. In this Letter, we present a method for predicting the patterning of ultrathin films on micron length scales with atomic resolution. We make quantitative predictions for the type of superstructures (stripes, honey-comb, triangular) and length scale of pattern formation of two metal-metal systems, Cu on Ru(0001) and Cu on Pd(111). Our findings are in excellent agreement with previous experiments and call for future experimental investigations of such systems.
  Physical Review Letters 01/2012; 35(81). · 7.37 Impact Factor
• Source

  Available from: Tapio Ala-Nissila

  Article: Stress release mechanisms for Cu on Pd(111) in the submonolayer and monolayer regimes

  J. Jalkanen, G. Rossi, O. Trushin, E. Granato, T. Ala-Nissila, S. C. Ying
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  ABSTRACT: We study the strain relaxation mechanisms of Cu on Pd(111) up to the monolayer regime using two different computational methodologies, basin-hopping global optimization and energy minimization with a repulsive bias potential. Our numerical results are consistent with experimentally observed layer-by-layer growth mode. However, we find that the structure of the Cu layer is not fully pseudomorphic even at low coverages. Instead, the Cu adsorbates forms fcc and hcp stacking domains, separated by partial misfit dislocations. We also estimate the minimum energy path and energy barriers for transitions from the ideal epitaxial state to the fcc-hcp domain pattern. Comment: 4 pages, 4 figures
  02/2010;