Interplay between kinetic roughening and phase ordering

Abstract

PACS. 05.70L -Nonequilibrium thermodynamics, irreversible processes. PACS. 75.70Kw -Domain structure. PACS. 75.40M -Numerical simulation studies.Abstract. -We studied interplay between kinetic roughening and phase ordering in 1+1 dimensional single-step solid-on-solid growth model with two kinds of particles and Ising-like interaction. Evolution of both geometrical and compositional properties was investigated by Monte Carlo simulations for various strengths of coupling. We found that the initial growth is strongly affected by interaction between species, scaling exponents are enhanced and the ordering on the surface is observed. However, after certain time, ordering along the surface stops and the scaling exponents cross over to exponents of the Kardar-Parisi-Zhang universality class. For sufficiently strong strength of coupling, ordering in vertical direction is present and leads to columnar structure persisting for a long time.Recently there has been considerable interest in growth induced surface roughening called kinetic roughening [1] and in phase ordering [2] independently. In kinetic roughening one is interested in the evolution of roughness during a nonequilibrium growth process. Phase ordering deals with the approach to equilibrium of a system quenched from a homogeneous high temperature phase into a two-component region. In both fields concept of scaling allowed to classify physical processes into universality classes. However, not very much is known so far about scaling exponents in systems where both processes, roughening as well as ordering, are relevant.Growth of many-component systems is in fact quite common situation. Many real materials are composed of two or more components but often the dynamics of one component is dominant and one can use a single-component growth model. For example, one can consider only kinetics of Ga atoms in studies of GaAs growth [3]. We are interested here in a more complex case when dynamics of Typeset using EURO-L a T E X

Reconstructed rough growing interfaces: Ridge-line trapping of domain walls

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“…Those display strong coupling between the Ising and roughness degrees of freedom, such as growth being pinned down by Ising domain walls [24][25][26]. Pinning favors to spontaneous facetting.…”

Relationship between Resistivity and Structure of Photosensitive Organic Silsesquioxanes by Impedance Spectroscopy and Solid-State 29Si Nuclear Magnetic Resonance

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