Magnetic structure at zigzag edges of bilayer ribbons

• Tipo: Artigo em Revista Científica Internacional
• Data: 2008

Autores

Eduardo V Castro (Autor) FCUP; Peres, NMR (Autor) Outra; Lopes M B L Dos Santos (Autor) FCUP

Revista

Título: Journal of Optoelectronics and Advanced Materials

Vol. 10

Páginas: 1716-1721

ISSN: 1454-4164

Editora: National Institute of Research and Development for Optoelectronics

Indexação

ISI Web of Knowledge - 12 Citações

Scopus - 13 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-003-Y6Z

Abstract (EN): We study the edge magnetization of bilayer graphene ribbons with zigzag edges. The presence of flat edge-state bands at the Fermi energy of undoped bilayer, which gives rise to a strong peak in the density of states, makes bilayer ribbons magnetic at the edges even for very small on-site electronic repulsion. Working with the Hubbard model in the Hartree Fock approximation we show that the magnetic structure in bilayer ribbons with zigzag edges is ferromagnetic along the edge, involving sites of the two layers, and antiferromagnetic between opposite edges. It is also shown that this magnetic structure is a consequence of the nature of the edge states present in bilayer ribbons with zigzag edges. Analogously to the monolayer case, edge site magnetization as large as m approximate to 0.2 mu(B) (per lattice site) even at small on-site Hubbard repulsion U approximate to 0.3 eV is realized in nanometer wide ribbons.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 6