2015 年 42 巻 3 号 p. 174-179
The growth of InAs quantum dots on GaAs(001) shows a new aspect of non-classical nucleation, namely the dynamic formation of preferred growth sites within the substrate. Using fully in situ scanning tunnelling microscopy - molecular beam epitaxy, we observe rapidly changing transitions between domains of different surface reconstruction a few nm in size. Nucleation of 3D islands is preferred on one particular reconstruction, blurring the line between heterogeneous and homogeneous nucleation as traditionally understood on a static substrate.