Busca avançada
Ano de início
Entree
(Referência obtida automaticamente do Web of Science, por meio da informação sobre o financiamento pela FAPESP e o número do processo correspondente, incluída na publicação pelos autores.)

Honeycomb and triangular domain wall networks in heteroepitaxial systems

Texto completo
Autor(es):
Elder, K. R. [1] ; Chen, Z. [1, 2] ; Elder, K. L. M. [3, 4] ; Hirvonen, P. [3, 4] ; Mkhonta, S. K. [5, 6] ; Ying, S. -C. [7] ; Granato, E. [7, 8] ; Huang, Zhi-Feng [6] ; Ala-Nissila, T. [3, 4, 7]
Número total de Autores: 9
Afiliação do(s) autor(es):
[1] Oakland Univ, Dept Phys, Rochester, MI 48309 - USA
[2] Northwestern Polytech Univ, Dept Appl Phys, Xian 710129 - Peoples R China
[3] Aalto Univ, Sch Sci, Dept Appl Phys, POB 11000, FI-00076 Aalto - Finland
[4] Aalto Univ, Sch Sci, COMP Ctr Excellence, POB 11000, FI-00076 Aalto - Finland
[5] Univ Swaziland, Dept Phys, Private Bag 4, Kwaluseni - Swaziland
[6] Wayne State Univ, Dept Phys & Astron, Detroit, MI 48201 - USA
[7] Brown Univ, Dept Phys, POB 1843, Providence, RI 02912 - USA
[8] Inst Nacl Pesquisas Espaciais, Lab Associado Sensores & Mat, BR-12227010 Sao Jose Dos Campos, SP - Brazil
Número total de Afiliações: 8
Tipo de documento: Artigo Científico
Fonte: Journal of Chemical Physics; v. 144, n. 17 MAY 7 2016.
Citações Web of Science: 8
Resumo

A comprehensive study is presented for the influence of misfit strain, adhesion strength, and lattice symmetry on the complex Moire 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 Moire 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. Published by AIP Publishing. (AU)

Processo FAPESP: 14/15372-3 - Dinâmica e defeitos topológicos em meios periódicos
Beneficiário:Enzo Granato
Linha de fomento: Auxílio à Pesquisa - Regular