The European Physical Journal B

, Volume 84, Issue 3, pp 419–424

Electronic and magnetic properties of SiC nanoribbons by F termination

Authors

  • D. B. Lu
    • College of Physics and Electronic EngineeringNanyang Normal University
    • College of Physics and Electronic EngineeringNanyang Normal University
  • Z. X. Yang
    • College of Physics and Information EngineeringHenan Normal University
  • H. R. Xu
    • College of Physics and Electronic EngineeringNanyang Normal University
  • C. Wang
    • College of Physics and Electronic EngineeringNanyang Normal University
  • Z. H. Gao
    • College of Physics and Electronic EngineeringNanyang Normal University
Regular Article Mesoscopic and Nanoscale Systems

DOI: 10.1140/epjb/e2011-20291-x

Cite this article as:
Lu, D.B., Song, Y.L., Yang, Z.X. et al. Eur. Phys. J. B (2011) 84: 419. doi:10.1140/epjb/e2011-20291-x

Abstract

By using the first-principles calculations, the electronic properties are studied for the F-terminated SiC nanoribbons (SiCNRs) with either zigzag edges (ZSiCNRs) or armchair edges (ASiCNRs). The results show that the broader F-terminated ZSiCNRs are metallic and the edge states appear at the Fermi level, while the F-terminated ASiCNRs are always semiconductors independent of their width but the edge states do not appear due to the Si-C dimer bonds at the edges. The charge density contours analyses shows that the Si-F and Si-C bonds are all ionic bonds due to the much stronger electronegativities of the F and C atoms than that of the Si atom. However, the C-F bonds display a typical non-polar covalent bonding feature because of the electronegativity difference between the F and C atoms of 1.5 is a much smaller than that of between the F and Si atoms of 2.2, as well as the tighter bounded C 2s 22p 2 electrons with smaller orbital radius than the Si 3s 23p 2 electrons. For both the F- and the H-terminated ZSiCNRs, the ground state is a ferromagnetic semiconductor.

Copyright information

© EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg 2011