by José Emilio Prieto and Ivan Markov

Abstract:

We have studied the monolayer-bilayer transformation in the case of the coherent Stranski-Krastanov growth. We have found that the energy of formation of a second-layer nucleus is largest at the center of the first-layer island and smallest on its corners. Thus nucleation is expected to take place at the corners (or the edges) rather than at the center of the islands as in the case of homoepitaxy. The critical nuclei have one atom in addition to a compact shape, which is either a square of i×i or a rectangle of i×(i−1) atoms, with itextgreater1 an integer. When the edge of the initial monolayer island is much larger than the critical nucleus size, the latter is always a rectangle plus an additional atom, adsorbed at the longer edge, which gives rise to a new atomic row in order to transform the rectangle into the equilibrium square shape.

Reference:

José Emilio Prieto and Ivan Markov, “Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots”, Physical Review B, vol. 84, no. 19, pp. 195417.

Bibtex Entry:

@article{prieto_second-layer_2011, title = {Second-layer nucleation in coherent {Stranski}-{Krastanov} growth of quantum dots}, volume = {84}, url = {https://link.aps.org/doi/10.1103/PhysRevB.84.195417}, doi = {10.1103/PhysRevB.84.195417}, abstract = {We have studied the monolayer-bilayer transformation in the case of the coherent Stranski-Krastanov growth. We have found that the energy of formation of a second-layer nucleus is largest at the center of the first-layer island and smallest on its corners. Thus nucleation is expected to take place at the corners (or the edges) rather than at the center of the islands as in the case of homoepitaxy. The critical nuclei have one atom in addition to a compact shape, which is either a square of i×i or a rectangle of i×(i−1) atoms, with i{textgreater}1 an integer. When the edge of the initial monolayer island is much larger than the critical nucleus size, the latter is always a rectangle plus an additional atom, adsorbed at the longer edge, which gives rise to a new atomic row in order to transform the rectangle into the equilibrium square shape.}, number = {19}, urldate = {2017-10-09}, journal = {Physical Review B}, author = {Prieto, José Emilio and Markov, Ivan}, month = nov, year = {2011}, pages = {195417}, file = {APS Snapshot:E:\cmam_papers\files\1111\PhysRevB.84.html:text/html;APS Snapshot:E:\Usuarios\Administrator\Zotero\storage\FJ6RUCD8\PhysRevB.84.html:text/html}, }