Role of alloy spacer layers in non top-on-top vertical correlation in multistacked systems - art. no. 125312

We focus on the role of spacer alloy decomposition in the vertical correlat ion for a bilayer of strained InAs quantum wires, where the spacer layer is an immiscible alloy. We show how the surface morphology combined with the strongly inhomogeneous strain distribution favors a V-shaped partial demixi ng of the spacer layer. We also demonstrate that this decomposition has tan gible consequences on the vertical organization when depositing a second wi re layer. Different configurations can be obtained from perfect top-on-top, to perfect vertical anticorrelation, via all kinds of oblique correlation.