Step Bunching with Alternation of Structural Parameters
نویسندگان
چکیده
منابع مشابه
New mechanism for impurity-induced step bunching
– Codeposition of impurities during the growth of a vicinal surface leads to an impurity concentration gradient on the terraces, which induces corresponding gradients in the mobility and the chemical potential of the adatoms. Here it is shown that the two types of gradients have opposing effects on the stability of the surface: Step bunching can be caused by impurities which either lower the ad...
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We study a minimal stochastic model of step bunching during growth on a one-dimensional vicinal surface. The formation of bunches is controlled by the preferential attachment of atoms to descending steps (inverse Ehrlich-Schwoebel effect) and the ratio d of the attachment rate to the terrace diffusion coefficient. For generic parameters (d>0) the model exhibits a very slow crossover to a nontri...
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When a heteroepitaxial film is grown on a vicinal substrate, the terrace steps at the growth front may bunch together to relieve strain, resulting in a rough surface. On the other hand, proper manipulation of the growth kinetics may suppress the inherent bunching instability, thus preserving step-flow growth. Here we show that the step dynamics in the early stages of growth can already determin...
متن کاملUnification of step bunching phenomena on vicinal surfaces
Pak-Wing Fok,1 Rodolfo R. Rosales,2 and Dionisios Margetis3 1Applied and Computational Mathematics, California Institute of Technology, Pasadena, California 91125, USA 2Department of Mathematics, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA 3Department of Mathematics and Institute for Physical Science and Technology, University of Maryland, College Park, Maryland 2...
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ژورنال
عنوان ژورنال: Journal of the Physical Society of Japan
سال: 2003
ISSN: 0031-9015,1347-4073
DOI: 10.1143/jpsj.72.2850