APT data of two stacked QDs. (a) APT data obtained from the analysed sample. In atoms are shown as yellow dots and Ga atoms as blue dots. (b,c) Perpendicular In composition slices of the APT data corresponding to the lower QD layer where the In inhomogeneous distribution is showed.
Hernández-Saz et al. Nanoscale Research Letters 2013 8:513 doi:10.1186/1556-276X-8-513