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 http://dx.doi.org/10.1209/0295-5075/88/56002
Published online 10 December 2009
EPL, 88 (2009) 56002
DOI: 10.1209/0295-5075/88/56002

Morphological instability of epitaxially stressed quantum rings

J. Colin

PHYMAT-CNRS UMR 6630, Université de Poitiers - BP 30179, 86962 Futuroscope Cedex, France, EU

jerome.colin@univ-poitiers.fr

received 1 September 2009; accepted in final form 12 November 2009; published December 2009
published online 10 December 2009

Abstract
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