Nanometer-scale sharpness in corner-overgrown heterostructures

Details Nanometer-scale sharpness in corner-overgrown heterostructures Nanometer-scale sharpness in corner-overgrown heterostructures

2008-03-27

arxiv.org/abs/0803.3986v2

Appl. Phys. Lett. 93, 193117, (2008)

Physics

Condensed Matter

Materials Science

4 pages, 3 figures

Scientific paper

10.1063/1.2988526

A corner-overgrown GaAs/AlGaAs heterostructure is investigated with transmission and scanning transmission electron microscopy, demonstrating self-limiting growth of an extremely sharp corner profile of 3.5 nm width. In the AlGaAs layers we observe self-ordered diagonal stripes, precipitating exactly at the corner, which are regions of increased Al content measured by an XEDS analysis. A quantitative model for self-limited growth is adapted to the present case of faceted MBE growth, and the corner sharpness is discussed in relation to quantum confined structures. We note that MBE corner overgrowth maintains nm-sharpness even after microns of growth, allowing the realization of corner-shaped nanostructures.

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