中国物理B ›› 2013, Vol. 22 ›› Issue (12): 120205-120205.doi: 10.1088/1674-1056/22/12/120205

• GENERAL • 上一篇    下一篇

GGA+U study of the electronic energy bands and state density of the wurtzite In1-xGaxN

王伟华a, 赵国忠a b, 梁希侠a   

  1. a Department of Physics, Inner Mongolia University, Hohhot 010021, China;
    b Department of Physics, Capital Normal University, Beijing 100048, China
  • 收稿日期:2013-03-08 修回日期:2013-05-08 出版日期:2013-10-25 发布日期:2013-10-25
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No. 50971094), the Natural Science Foundation of Beijing, China (Grant Nos. KZ201310028032 and 1092007), and the Domestic Visiting Program for the Graduate Students of Inner Mongolia University, China.

GGA+U study of the electronic energy bands and state density of the wurtzite In1-xGaxN

Wang Wei-Hua (王伟华)a, Zhao Guo-Zhong (赵国忠)a b, Liang Xi-Xia (梁希侠)a   

  1. a Department of Physics, Inner Mongolia University, Hohhot 010021, China;
    b Department of Physics, Capital Normal University, Beijing 100048, China
  • Received:2013-03-08 Revised:2013-05-08 Online:2013-10-25 Published:2013-10-25
  • Contact: Zhao Guo-Zhong E-mail:guozhong-zhao@126.com
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No. 50971094), the Natural Science Foundation of Beijing, China (Grant Nos. KZ201310028032 and 1092007), and the Domestic Visiting Program for the Graduate Students of Inner Mongolia University, China.

摘要: The electronic band structures, densities of states (DOSs), and projected densities of states (PDOSs) of the wurtzite In1-xGaxN with x=0, 0.0625, 0.125 are studied using the generalized-gradient approximation (GGA) and GGA+U in density functional theory. Our calculations suggest that in the case of wurtzite InN it is important to apply an on-site Hubbard correction to both the d states of indium and the p states of nitrogen in order to recover the correct energy level symmetry and obtain a reliable description of the InN band structure. The method is used to study the electronic properties of the wurtzite In1-xGaxN. The conduction band minimum (CBM) energy increases, while the valence band maximum (VBM) energy decreases with the increase of the gallium concentration. The effect leads to broadening the band gap (BG) and the valence band width (VBW). Furthermore, the compressive strain in the crystal can cause the BG and the VBW to increase with the increase of gallium concentrations.

关键词: GGA+U, electronic structures, projected density of states, In1-xGaxN

Abstract: The electronic band structures, densities of states (DOSs), and projected densities of states (PDOSs) of the wurtzite In1-xGaxN with x=0, 0.0625, 0.125 are studied using the generalized-gradient approximation (GGA) and GGA+U in density functional theory. Our calculations suggest that in the case of wurtzite InN it is important to apply an on-site Hubbard correction to both the d states of indium and the p states of nitrogen in order to recover the correct energy level symmetry and obtain a reliable description of the InN band structure. The method is used to study the electronic properties of the wurtzite In1-xGaxN. The conduction band minimum (CBM) energy increases, while the valence band maximum (VBM) energy decreases with the increase of the gallium concentration. The effect leads to broadening the band gap (BG) and the valence band width (VBW). Furthermore, the compressive strain in the crystal can cause the BG and the VBW to increase with the increase of gallium concentrations.

Key words: GGA+U, electronic structures, projected density of states, In1-xGaxN

中图分类号:  (Numerical simulation; solution of equations)

  • 02.60.Cb
03.75.Hh (Static properties of condensates; thermodynamical, statistical, and structural properties)