| Issue |
EPL
Volume 88, Number 5, December 2009
|
|
|---|---|---|
| Article Number | 56002 | |
| Number of page(s) | 5 | |
| Section | Condensed Matter: Structural, Mechanical and Thermal Properties | |
| DOI | https://doi.org/10.1209/0295-5075/88/56002 | |
| Published online | 10 December 2009 | |
Morphological instability of epitaxially stressed quantum rings
PHYMAT-CNRS UMR 6630, Université de Poitiers - BP 30179, 86962 Futuroscope Cedex, France, EU
Corresponding author: jerome.colin@univ-poitiers.fr
Received:
1
September
2009
Accepted:
12
November
2009
The size and morphological instability of a heteroepitaxially stressed ring of constant height and constant area is theoretically investigated through a static calculation of the edge and elastic energy terms. It is shown that above a critical value of stress, the formation of a ring-shaped nanostructure of selected width is favoured compared to a circular island of the same area. It is then found that in-phase fluctuations of both ring edges may preferentially develop leading to serpentine shape. When the ring width increases and its radii decrease, the possibility of development of anti-phase fluctuations leading to the formation of more complicated shape is discussed.
PACS: 62.25.-g – Mechanical properties of nanoscale systems / 68.35.Ct – Interface structure and roughness / 68.65.Hb – Quantum dots (patterned in quantum wells)
© EPLA, 2009
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