Dan Huang

Publications (4)8.56 Total impact

• Article: Electronic structure and magnetic couplings in anatase TiO(2):V codoped with N, F, Cl.

  Dan Huang, Yu-Jun Zhao, Di-Hu Chen, Yuan-Zhi Shao
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  ABSTRACT: Using first-principles calculations, we have discussed the stability of the defect charge state and magnetic properties of V(Ti) defects in anatase TiO(2). While N, F, and Cl are typical nonmetal dopants for photocatalytic activity enhancement of TiO(2), their influence on the magnetism of TiO(2):V is also investigated. We find that V(Ti)(+) (i.e. V(5+)) would be favored in the p-type region and V(Ti)(0) (i.e. V(4+)) and V(Ti)(-) (i.e. V(3+)) would be stable in the n-type region. It is demonstrated that while V(5+) does not carry any local moment, both V(4+) and V(3+) defects are preferred to ferromagnetic ordering. Thus, n-type dopants (such as F and Cl) in TiO(2):V samples, which could stabilize V as V(3+), are suggested for their many applications requiring combined magnetic and optical functionality, while p-type dopants (such as N) are not suggested.
  Journal of Physics Condensed Matter 03/2009; 21(12):125502. · 2.55 Impact Factor
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  Available from: 152.92

  Article: Structural instability of epitaxial zinc-blende vanadium pnictides and chalcogenides for half-metallic ferromagnets

  Dan Huang, Yu-Jun Zhao, Li-Juan Chen, Di-Hu Chen, Yuan-Zhi Shao
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  ABSTRACT: We present a first-principles study of the criteria governing the electronic and structural stability of epitaxial, half-metallic ferromagnetic materials with zinc-blende structure. Upon their application to vanadium pnictides and chalcogenides, we find that the criteria for structural stability are crucial when the optimal match pattern of an epitaxial film with the substrate is considered. Our study shows that thick zinc-blende epitaxial films are difficult to obtain by coherent epitaxial growth for vanadium pnictides and chalcogenides. We suggest that more attention needs to be paid to spin polarized ultrathin films (instead of the thick films) as high spin injection materials.
  Journal of Applied Physics 10/2008; · 2.17 Impact Factor
• Article: Magnetism and clustering in Cu doped ZnO

  Dan Huang, Yu-Jun Zhao, Di-Hu Chen, Yuan-Zhi Shao
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  ABSTRACT: The influence of defect charge state on the magnetism of Cu doped ZnO as well as the Cu defects clustering have been investigated by the first-principles calculations. We demonstrate that p-type ZnO:Cu could have ferromagnetic (FM) property, but n-type ZnO:Cu would not have local magnetic moment. Furthermore, the neutral substitutive Cu defects are found to be favorable in clustering, which maintains the FM ordering.
  Applied Physics Letters 05/2008; 92(18):182509-182509-3. · 3.84 Impact Factor
• Source

  Available from: itp.cn

  Article: Noise Correlation Induced Synchronization in a Mutualism Ecosystem

  Wei-Rong Zhong, Yuan-Zhi Shao, Zhen-Hui He, Meng-Jie Bie, Dan Huang
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  ABSTRACT: Understanding the cause of the synchronization of population evolution is an important issue for ecological improvement. Here we present a Lotka-Volterra-type model driven by two correlated environmental noises and show, via theoretical analysis and direct simulation, that noise correlation can induce a synchronization of the mutualists. The time series of mutual species exhibit a chaotic-like fluctuation, which is independent to the noise correlation, however, the chaotic fluctuation of mutual species ratio decreases with the noise correlation. A quantitative parameter defined for characterizing chaotic fluctuation provides a good approach to measure when the complete synchronization happens.
  02/2007;