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Mass transport of adsorbates near a discontinuous structural phase transition

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Autor(es):
Granato, E. ; Ying, S. C. ; Elder, K. R. ; Ala-Nissila, T.
Número total de Autores: 4
Tipo de documento: Artigo Científico
Fonte: Physical Review B; v. 94, n. 23 DEC 9 2016.
Citações Web of Science: 0
Resumo

We study the mass transport dynamics of an adsorbed layer near a discontinuous incommensurate striped-oneycomb phase transition via numerical simulations of a coarse-grained model focusing on the motion of domain walls rather than individual atoms. Following an initial step profile created in the incommensurate striped phase, an intermediate hexagonal incommensurate phase nucleates and grows, leading to a bifurcation into two sharp profiles propagating in opposite directions as opposed to broad profiles induced by atomic diffusive motion. Our results are in agreement with recent numerical simulations of a microscopic model as well as experimental observations for the Pb/Si(111) adsorbate system. (AU)

Processo FAPESP: 14/15372-3 - Dinâmica e defeitos topológicos em meios periódicos
Beneficiário:Enzo Granato
Linha de fomento: Auxílio à Pesquisa - Regular