Volume 88, Number 5, December 2009
|Number of page(s)||5|
|Section||Condensed Matter: Structural, Mechanical and Thermal Properties|
|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: firstname.lastname@example.org
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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