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Equilibrium shape and dislocation nucleation in strained epitaxial nanoislands.

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.author Jalkanen, Jari
dc.contributor.author Trushin, Oleg
dc.contributor.author Granato, E.
dc.contributor.author Ying, See Chen
dc.contributor.author Ala-Nissila, Tapio
dc.date.accessioned 2017-06-20T11:17:35Z
dc.date.available 2017-06-20T11:17:35Z
dc.date.issued 2005
dc.identifier.citation Jalkanen , J , Trushin , O , Granato , E , Ying , S C & Ala-Nissila , T 2005 , ' Equilibrium shape and dislocation nucleation in strained epitaxial nanoislands. ' , Physical Review B , vol. 72 , no. 8 , 081403 , pp. 1-4 . https://doi.org/10.1103/PhysRevB.72.081403 en
dc.identifier.issn 1550-235X
dc.identifier.other PURE UUID: 5922694e-8798-43c6-b298-44730e2c4e5e
dc.identifier.other PURE ITEMURL: https://research.aalto.fi/en/publications/equilibrium-shape-and-dislocation-nucleation-in-strained-epitaxial-nanoislands(5922694e-8798-43c6-b298-44730e2c4e5e).html
dc.identifier.other PURE FILEURL: https://research.aalto.fi/files/13407340/PhysRevB.72.081403.pdf
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/26959
dc.description.abstract We study numerically the equilibrium shapes, shape transitions, and dislocation nucleation of small strained epitaxial islands with a two-dimensional atomistic model, using simple interatomic pair potentials. We first map out the phase diagram for the equilibrium island shapes as a function of island size (up to N=105 atoms) and lattice misfit with the substrate, and show that nanoscopic islands have four generic equilibrium shapes, in contrast with predictions from the continuum theory of elasticity. For increasing substrate-adsorbate attraction, we find islands that form on top of a finite wetting layer as observed in Stranski-Krastanow growth. We also investigate energy barriers and transition paths for transitions between different shapes of the islands and for dislocation nucleation in initially coherent islands. In particular, we find that dislocations nucleate spontaneously at the edges of the adsorbate-substrate interface above a critical size or lattice misfit. en
dc.format.extent 1-4
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries Physical Review B en
dc.relation.ispartofseries Volume 72, issue 8 en
dc.rights openAccess en
dc.title Equilibrium shape and dislocation nucleation in strained epitaxial nanoislands. en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department Department of Applied Physics en
dc.identifier.urn URN:NBN:fi:aalto-201706205683
dc.identifier.doi 10.1103/PhysRevB.72.081403
dc.type.version publishedVersion


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