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Critical misfit for dislocation stability in self‐assembled islands
Author(s) -
Denker U.,
Jesson D. E.
Publication year - 2005
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.200440080
Subject(s) - dislocation , nanostructure , position (finance) , condensed matter physics , materials science , stability (learning theory) , instability , motion (physics) , surface energy , surface (topology) , nanotechnology , crystallography , chemical physics , physics , chemistry , classical mechanics , geometry , mechanics , mathematics , composite material , computer science , machine learning , finance , economics
The energy of a dislocation within a coherently strained nanostructure is calculated as a function of misfit and position. If the misfit is decreased below a critical value, no energetically stable position for the dislocations exists inside the island. This instability is understood in terms of a simple two‐dimensional model and we propose that this can lead to motion of the nanostructure across the surface by a novel crawl mechanism. (© 2005 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)