Cooperative nucleation and evolution in InGaAs quantum dots in multiply stacked structures

Xie, Qianghua; Brown, J. L.; Van Nostrand, J. E.
April 2001
Applied Physics Letters;4/23/2001, Vol. 78 Issue 17, p2491
Academic Journal
We report a type of vertical self-organization of In[sub 0.6]Ga[sub 0.4]As quantum dots (QDs) wherein the dot density for the top layer (N[sub T]) doubles that of the seed layer (N[sub S]). The experimental observation fits well with a scheme of QD vertical self-organization accompanied by additional cooperative dot nucleation at the face centers of an approximate two-dimensional array defined by the embedded seed dots. The dots in the top layer undergo a shape transition from {023} to {011} and a simultaneous shape stabilization and size equalization. © 2001 American Institute of Physics.


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