Domain boundaries in silicene:Density functional theory calculations on electronic properties

• Published in: Chinese physics B 2015-08, Vol.24 (8), p.116-119
• Main Author: 肖红君 张礼智 杜世萱 高鸿钧
• Format: Article
• Language: English
• Subjects: Boundaries; boundaries; silicene; line; Chairs; Construction; defect; density; Density functional theory; domain; Electronic properties; functional; Graphene; Linkages; Mathematical analysis; theory
• ISSN: 1674-1056; 2058-3834; 1741-4199
• DOI: 10.1088/1674-1056/24/8/086806

By using density functional theory(DFT)-based first-principles calculations, the structural stability and electronic properties for two kinds of silicene domain boundaries, forming along armchair edge and zigzag edge, have been investigated. The results indicate that a linkage of tetragonal and octagonal rings(4|8) appears along the armchair edge, while a linkage of paired pentagonal and octagonal rings(5|5|8) appears along the zigzag edge. Different from graphene, the buckling properties of silicene lead to two mirror symmetrical edges of silicene line-defect. The formation energies indicate that the 5|5|8 domain boundary is more stable than the 4|8 domain boundary. Similar to graphene, the calculated electronic properties show that the 5|5|8 domain boundaries exhibit metallic properties and the 4|8 domain boundaries are half-metal.Both domain boundaries create the perfect one-dimensional(1D) metallic wires. Due to the metallic properties, these two kinds of nanowires can be used to build the silicene-based devices.