Ala-Nissila_1.4948370.pdf (8.63 MB)
Honeycomb and triangular domain wall networks in heteroepitaxial systems
journal contribution
posted on 2018-01-19, 14:38 authored by Ken R. Elder, Z. Chen, K.L.M. Elder, Petri Hirvonen, S.K. Mkhonta, S.C. Ying, E. Granato, Zhi-Feng Huang, Tapio Ala-NissilaTapio Ala-Nissila© 2016 Author(s).A comprehensive study is presented for the influence of misfit strain, adhesion strength, and lattice symmetry on the complex Moiré patterns that form in ultrathin films of honeycomb symmetry adsorbed on compact triangular or honeycomb substrates. The method used is based on a complex Ginzburg-Landau model of the film that incorporates elastic strain energy and dislocations. The results indicate that different symmetries of the heteroepitaxial systems lead to distinct types of domain wall networks and phase transitions among various surface Moiré patterns and superstructures. More specifically, the results show a dramatic difference between the phase diagrams that emerge when a honeycomb film is adsorbed on substrates of honeycomb versus triangular symmetry. It is also shown that in the small deformation limit, the complex Ginzburg-Landau model reduces to a two-dimensional sine-Gordon free energy form. This free energy can be solved exactly for one dimensional patterns and reveals the role of domains walls and their crossings in determining the nature of the phase diagrams.
History
School
- Science
Department
- Mathematical Sciences
Published in
Journal of Chemical PhysicsVolume
144Issue
17Citation
ELDER, K.R. ...et al., 2016. Honeycomb and triangular domain wall networks in heteroepitaxial systems. Journal of Chemical Physics, 144: 174703.Publisher
© the Authors. Published by AIP PublishingVersion
- VoR (Version of Record)
Acceptance date
2016-04-01Publication date
2016Notes
This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. The following article appeared in ELDER, K.R. ...et al., 2016. Honeycomb and triangular domain wall networks in heteroepitaxial systems. Journal of Chemical Physics, 144: 174703 and may be found at https://doi.org/10.1063/1.4948370ISSN
0021-9606Publisher version
Language
- en