Volume 86, Number 4, May 2009
Article Number 46002
Number of page(s) 6
Section Condensed Matter: Structural, Mechanical and Thermal Properties
Published online 27 May 2009
EPL, 86 (2009) 46002
DOI: 10.1209/0295-5075/86/46002

Divacancies in graphitic boron nitride sheets

M. S. Si, J. Y. Li, H. G. Shi, X. N. Niu and D. S. Xue

Key Laboratory of Magnetism and Magnetic Materials of the Ministry of Education, Lanzhou University Lanzhou 730000, PRC

received 30 January 2009; accepted in final form 22 April 2009; published May 2009
published online 27 May 2009

Spin-polarized density functional theory has been used to study the properties of seven kinds of divacancies in graphitic boron nitride sheets. We find that some divacancies are magnetic and the symmetry of the sheets is broken by the distortion of atoms which are close to the vacancies. According to the formation energies, the neighboring boron and nitrogen vacancy pair is the most likely to form. Our calculations demonstrate that the divacancies can induce fundamental changes in the electronic properties of the sheet, making semiconducting–to–half-metallic transitions occur. The results can be used to customize the spintronics devices.

61.46.Fg - Nanotubes.
31.15.A- - Ab initio calculations.
68.65.-k - Low-dimensional, mesoscopic, and nanoscale systems: structure and nonelectronic properties.

© EPLA 2009