We formulate a phase-field description of step dynamics on vicinal surfaces that makes use of a single dynamical field, at variance with previous analogous works in which two coupled fields are employed, namely, a phase-field proper plus the physical adatom concentration. Within an asymptotic sharp interface limit, our formulation is shown to retrieve the standard Burton-Cabrera-Frank model in the general case of asymmetric attachment coefficients «Ehrlich-Schwoebel effect». We confirm our analytical results by means of numerical simulations of our phase-field model. Our present formulation seems particularly well adapted to generalization when additional physical fields are required.
Keywords: Theory and models of crystal growth; physics of crystal growth, crystal morphology, and orientation, Interface structure and roughness, Molecular, atomic, ion, and chemical beam epitaxy,….
Physical Review E. Volumen: 79 Numero: 2 Páginas: 021601-1-021601-8
Journal Impact Factor: JCR impact factor 2.284 (2017)
DOI reference: 10.1103/PhysRevE.79.021601
Publicado en papel: Febrero 2009.