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In situ morphological investigation of the {105} faceted Ge islands on theSi(001) surface (hut clusters) have been carried out using an ultra high vacuuminstrument integrating a high resolution scanning tunnelling microscope and amolecular beam epitaxy vessel. Both species of hut clusters--pyramids andwedges--were found to have the same structure of the {105} facets which wasvisualized. Structures of vertexes of the pyramidal clusters and ridges of thewedge-shaped clusters were revealed as well and found to be different. Thisallowed us to propose a crystallographic model of the {105} facets as well asmodels of the atomic structure of both species of the hut clusters. Aninference is made that transitions between the cluster shapes are impossible.

Atomic structure of Ge quantum dots on the Si(001) surface