Step Patterns on Vicinal Reconstructed Surfaces
نویسنده
چکیده
Step patterns on vicinal (2× 1) reconstructed surfaces of noble metals Au(110) and Pt(110), miscut towards the (100) orientation, are investigated. The free energy of the reconstructed surface with a network of crossing opposite steps is calculated in the strong chirality regime when the steps cannot make overhangs. It is explained why the steps are not perpendicular to the direction of the miscut but form in equilibrium a network of crossing steps which make the surface to look like a fish skin. The network formation is the consequence of competition between the – predominantly elastic – energy loss and entropy gain. It is in agreement with recent scanning-tunnelling-microscopy observations on vicinal Au(110) and Pt(110) surfaces.
منابع مشابه
Instability and wavelength selection during step flow growth of metal surfaces vicinal to fcc(001).
We study the onset and development of ledge instabilities during growth of vicinal metal surfaces using kinetic Monte Carlo simulations. We observe the formation of periodic patterns at [110] close packed step edges on surfaces vicinal to fcc(001) under realistic molecular beam epitaxy conditions. The corresponding wavelength and its temperature dependence are studied in detail. Simulations sug...
متن کاملSelf-organized nanoscale pattern formation on vicinal Si(111) surfaces via a two-stage faceting transition.
We demonstrate a self-organized pattern formation on vicinal Si(111) surfaces that are miscut toward the [2;11] direction. All the patterns, consisting of a periodic array of alternating (7 x 7) reconstructed terraces and step-bunched facets, have the same periodicity and facet structure, independent of the miscut angle, while the width of the facets increases linearly with miscut angle. We att...
متن کاملStep-step interaction on vicinal Si(001) surfaces studied by scanning tunneling microscopy
We report on measurements of step-step interaction on a flat Si 111 7 7 surface and on vicinal Si 001 surfaces with miscut angles ranging between 0.2° and 8°. Starting from scanning tunneling microscopy images of these surfaces and describing steps profile and interactions by the continuum step model, we measured the self-correlation function of single steps and the distribution of terrace widt...
متن کاملCurrent-Induced Step Bending Instability on Vicinal Surfaces
Motivated by recent experiments on current induced step bunching on Si(111) surfaces, we study a generalized 2D Barton-Cabrera-Franck model, where adatoms have a diffusion bias parallel to the step edges and there is an attachment barrier at the step edge. We find a new linear instability with novel step patterns. Monte Carlo simulations on a solid-on-solid model are used to study the instabili...
متن کاملAll-electron first-principles investigations of the energetics of vicinal Cu surfaces
Using first-principles calculations we studied the energetics surface energy, step energy, stability with respect to faceting of the lowand high-Miller-index vicinal Cu surfaces, namely, the 111 , 100 , 110 , 311 , 331 , 210 , 211 , 511 , 221 , 711 , 320 , 553 , 410 , 911 , and 332 surfaces. Our calculations are based on density-functional theory employing the all-electron full-potential linear...
متن کامل