Two-dimensional octagon-structure monolayer of nitrogen group elements and the related nano-structures

Abstract

In the purpose of expanding the family of two-dimensional materials, we predict the existence of two-dimensional octa-structure of nitrogen group elements that are composed of squares and octagons in first-principle method based on density functional theory (DFT). From our calculations, electronic structures of all monolayers show that they are semiconductors with indirect (N, P, Bi) and direct (As, Sb) band gaps (0.57-2.61eV). Nano-ribbons of three different unpassivated edges and their band structures are also investigated. Because of the reconstruction on the edges and dangling bonds, there exist ferromagnetic edge states in P, As, Sb nano-ribbons with different edges, and a Dirac point near π is found in the band structure of one specific N nano-ribbon. These structures may be useful in future applications, such as semiconductor devices, spintronics, hydrogen storage and quantum computation.

8 pages, 5 figures, 2 tables

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• Phonon dispersions and electronic structures of two-dimensional IV-V compounds
• Stabilities and novel electronic structures of three carbon nitride bilayers
• Detecting topological phases in the square-octagon lattice with statistical methods
• Einstein-de Haas Effect of Topological Magnons
• Evidence of a two-dimensional nitrogen crystalline structure on silver surfaces
• Topologically nontrivial flat bands and quantum Hall crossovers in square-octagon lattice materials