Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots

Details Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots Second-layer nucleation in coherent Stranski-Krastanov growth of quantum dots

2011-07-28

arxiv.org/abs/1107.5677v2

Phys. Rev. B 84, 195417 (2011)

Physics

Condensed Matter

Materials Science

6 pages, 4 figures. Accepted version, minor changes

Scientific paper

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.

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