Nucleation on a stepped surface with an Ehrlich-Schwöbel barrier

0437043 - FZÚ 2015 RIV GB eng J - Článek v odborném periodiku
Chromcová, Zdeňka - Tringides, M.C. - Chvoj, Zdeněk
Nucleation on a stepped surface with an Ehrlich-Schwöbel barrier.
Journal of Physics-Condensed Matter. Roč. 25, č. 26 (2013), "265003-1"-"265003-13". ISSN 0953-8984. E-ISSN 1361-648X
Grant CEP: GA AV ČR IAA100100903; GA ČR GPP204/10/P331; GA MŠMT ME09048
Institucionální podpora: RVO:68378271
Klíčová slova: flow growth * epitaxy * transition
Kód oboru RIV: BM - Fyzika pevných látek a magnetismus
Impakt faktor: 2.223, rok: 2013

During deposition on a stepped surface the growth mode depends on the conditions such as temperature T, deposition rate F and width of the terraces w. In this work we studied the influence of all the above mentioned characteristics using the kinetic Monte Carlo (kMC) technique. We concentrated on the conditions on the terrace at the moment of the first nucleation. The critical density of monomers for nucleation eta(m) decreases with the width of the terrace and the nucleation starts at surprisingly low densities of monomers. We tested several definitions of the critical width for nucleation w(c) used in various articles in the past and we compared our results with results of the analytical steady-state mean-field model (Ranguelov and Altman 2007 Phys. Rev. B 75 245419). To check how the simplified assumption about the steady-state regime during deposition influences the resulting dependence of w(c) similar or equal to (D/F)(kappa), we set and also solved a time-dependent analytical model. This analytical model as well as kMC predict that w(c) similar or equal to (D/F)(1/5).
Trvalý link: http://hdl.handle.net/11104/0240631