The self-assembly of epitaxial quantum dots on (001) surfaces, driven by compressive strain, is a widely used tool in semiconductor optoelectronics. In contrast, the growth of quantum dots on (111) and (110) surfaces has historically been a significant challenge. In most cases the strain relaxes rapidly via dislocation nucleation and glide before quantum dots can form. In this paper, we discuss a method for the reliable and controllable self-assembly of quantum dots on both (111) and (110) surfaces, where tensile strain is now the driving force. By showing that tensile-strained self-assembly is applicable to several material systems, we demonstrate the versatility of this technique. We believe that tensile-strained self-assembly represents a powerful tool for heterogeneous materials integration, and nanomaterial development, with future promise for band engineering and quantum optics applications.
The vast majority of research on epitaxial quantum dots use compressive strain as the driving force for self-assembly on
the (001) surface, with InAs/GaAs(001) and Ge/Si(001) being the best-known examples. In this talk, I will discuss our
work on determining the feasibility of growing coherent, tensile-strained III-V nanostructures on a (110) surface. GaP on
GaAs(110) was chosen as an initial test system. It is hoped that our efforts on self-assembled, tensile-strained dots on a
(110) surface will lead the way to new devices exploiting the fundamental differences between the (110) and (001)
surfaces. Furthermore it is anticipated that this work will form the first step towards a more general description of
self-assembled nanostructure growth under tensile strain.
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