The editor and publisher are retracting the referenced article1 due to substantial overlap with a previous publication.2 Specifically, Figs. 1 and 2–6 from Ref. 1 are identical to Figs. 1 and 10–14 in Ref. 2, and Ref. 1 includes large sections of text that have been reproduced from Ref. 2. Both the figures and text were reproduced without proper attribution, and this is not consistent with the ethical standards of AIP Publishing and Applied Physics Letters.

The following authors agree to this retraction: M. Grundmann, J. Christen, and D. Bimberg.

The other authors could not be reached for comment.

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