计算物理 ›› 2010, Vol. 27 ›› Issue (5): 752-758.

• 研究论文 • 上一篇    下一篇

A-La2O3电子结构和光学性质的第一性原理计算

刘其军, 刘正堂, 冯丽萍   

  1. 西北工业大学材料学院, 凝固技术国家重点实验室, 陕西 西安 710072
  • 收稿日期:2009-05-18 修回日期:2009-10-25 出版日期:2010-09-25 发布日期:2010-09-25
  • 作者简介:刘其军(1985-),男,四川宜宾,博士生,主要从事功能薄膜材科的理论计算及实验研究.
  • 基金资助:
    航空科学基金(2008ZF53058);教育部博士点基金(200806991032);西北工业大学基础研究基金(NWPU-FFR-W018108)资助项目

First-principles Study of Electronic Structure and Optical Properties of A-La2O3

LIU Qijun, LIU Zhengtang, FENG Liping   

  1. State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi, an 710072, China
  • Received:2009-05-18 Revised:2009-10-25 Online:2010-09-25 Published:2010-09-25

摘要: 采用基于密度泛函理论(DFT)框架下广义梯度近似平面波超软赝势法,计算A-La2O3的电子结构和光学性质.结果表明,A-La2O3属于间接带隙氧化物,禁带宽度为3.72 eV;其价带主要由La的5s,5p和6s态电子以及O的2s和2p态电子构成,导带主要由La的5d态电子构成.经带隙校正后,计算得到A-La2O3在(100)和(001)方向上的光学线性响应函数随光子能量的变化关系,包括复介电函数、复折射率、吸收光谱、反射光谱、损失函数和光电导谱.结果表明,A-La2O3在(100)和(001)方向上具有光学各向异性,并且具有从近紫外到红外的透明区域,为A-La2O3的应用提供了理论依据.

关键词: A-La2O3, 电子结构, 光学性质, 第一性原理

Abstract: Electronic structure and optical properties of A-La2O3 are investigated with plane waves ultrasoft pseudopotential technique in density functional theory (DFT).Calculated results show that A-La2O3 is indirect oxide with a band gap of 3.72 eV.Valence bands of A-La2O3 are composed of La-5s,La-5p,La-6s,O-2s,O-2p and the conduction bands are mainly composed of La-5d.With band gap correction,optical linear response functions of A-La2O3 as a function of photon energy are obtained including complex dielectric function,complex of refractive,absorption coefficients,reflectivity,loss function and complex conductivity function in(100) and(001) directions.It shows that A-La2O3 shows optical anisotropy in polarization directions(100) and(001),and A-La2O3 is high transmission from near-ultraviolet to infrared,which offers a theoretical basis for applications.

Key words: A-La2O3, electronic structure, optical properties, first-principles

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