Honeycomb and triangular domain wall networks in heteroepitaxial systems

Research output: Contribution to journalArticleScientificpeer-review

Researchers

Research units

  • Oakland University
  • Northwestern Polytechnical University Xian
  • Wayne State University
  • Brown University
  • National Institute for Space Research

Abstract

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.

Details

Original languageEnglish
Article number174703
Pages (from-to)1-11
JournalJournal of Chemical Physics
Volume144
Issue number17
Publication statusPublished - 7 May 2016
MoE publication typeA1 Journal article-refereed

Download statistics

No data available

ID: 6559842