Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots
Entity
UAM. Departamento de Física de la Materia CondensadaPublisher
American Physical SocietyDate
2011-11-04Citation
10.1103/PhysRevB.84.195417
Physical Review B 84.19 (2011): 195417
ISSN
1098-0121 (print); 1550-235X (online)DOI
10.1103/PhysRevB.84.195417Funded by
This work was supported by the Spanish MiCInn, Project No. FIS2008-01431Project
Gobierno de España. FIS2008-01431Editor's Version
http://dx.doi.org/10.1103/PhysRevB.84.195417Subjects
FísicaRights
© 2011 American Physical SocietyAbstract
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>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
Files in this item
Google Scholar:Prieto, José Emilio
-
Markov, Ivan
This item appears in the following Collection(s)
Related items
Showing items related by title, author, creator and subject.