TY - JOUR
T1 - Surface islands and their elastic interaction with adatoms
AU - Kouris, Demitris
AU - Peralta, Alonso
AU - Sieradzki, Karl
N1 - Funding Information:
This work was supported by the National Science Foundation, Division of Materials Research (Bruce A. MacDonald, Program Director), under Grant DMR-9510663
PY - 2000/1/20
Y1 - 2000/1/20
N2 - We describe the elastic interaction between adatoms on a (001) bcc surface and monolayer-high two- and three-dimensional islands, within the general context of thin-film growth. A discrete harmonic model based on the concepts of eigenstrain and surface stress yields the elastic field owing to the presence of adatoms and islands. Adatoms can be attracted or repelled by islands, depending on the sign of the interaction energy. Our results indicate that the elastic field does not generally favor a flat two-dimensional growth mode for homoepitaxy, or heteroepitaxy, when the overlayer is in compression. Based on elastic interactions alone, our results indicate that, in heteroepitaxy, two-dimensional step-flow growth becomes likely only for overlayers in tension. The model used in the study offers substantial advantages in computational efficiency when compared with atomic simulations that are the norm in this field.
AB - We describe the elastic interaction between adatoms on a (001) bcc surface and monolayer-high two- and three-dimensional islands, within the general context of thin-film growth. A discrete harmonic model based on the concepts of eigenstrain and surface stress yields the elastic field owing to the presence of adatoms and islands. Adatoms can be attracted or repelled by islands, depending on the sign of the interaction energy. Our results indicate that the elastic field does not generally favor a flat two-dimensional growth mode for homoepitaxy, or heteroepitaxy, when the overlayer is in compression. Based on elastic interactions alone, our results indicate that, in heteroepitaxy, two-dimensional step-flow growth becomes likely only for overlayers in tension. The model used in the study offers substantial advantages in computational efficiency when compared with atomic simulations that are the norm in this field.
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U2 - 10.1016/S0039-6028(99)01091-2
DO - 10.1016/S0039-6028(99)01091-2
M3 - Article
AN - SCOPUS:0033896289
SN - 0039-6028
VL - 445
SP - 420
EP - 429
JO - Surface Science
JF - Surface Science
IS - 2-3
ER -