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The authors have investigated a shape transformation during the vertical stacking of InGaAs quantum rings (QRs) on GaAs(001). Samples have been grown by means of molecular beam epitaxy. The initial QR layer exhibits nearly round-shaped, flat disks. Especially for a very thin spacer layer of
Published in:
Applied Physics Letters
(Volume:91
,
Issue:
4
)
Date of Publication: Jul 2007