中国物理B ›› 2008, Vol. 17 ›› Issue (6): 2277-2280.doi: 10.1088/1674-1056/17/6/057

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Generalization of iterative perturbation theory and coherent potential approximation (ITP+CPA) to double exchange model with orbital degeneracy

刘自信1, 李明2, 文生辉3   

  1. (1)Department of Physics , Henan Normal University, Xinxiang 453007, China; (2)Department of Physics , Nanjing University, Nanjing 210093, China; (3)Department of Physics, Henan Institute of Education, Zhengzhou 450014, China
  • 收稿日期:2007-10-18 修回日期:2007-12-19 出版日期:2008-06-20 发布日期:2008-06-20
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No 60476047) and the Natural Science Foundation of Henan Province, China (Grant No 0411011700).

Generalization of iterative perturbation theory and coherent potential approximation (ITP+CPA) to double exchange model with orbital degeneracy

Liu Zi-Xin(刘自信)a), Wen Sheng-Hui(文生辉)b), and Li Ming(李明)c)   

  1. a Department of Physics , Henan Normal University, Xinxiang 453007, China; b Department of Physics, Henan Institute of Education, Zhengzhou 450014, China; c Department of Physics , Nanjing University, Nanjing 210093, China
  • Received:2007-10-18 Revised:2007-12-19 Online:2008-06-20 Published:2008-06-20
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No 60476047) and the Natural Science Foundation of Henan Province, China (Grant No 0411011700).

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摘要： A combination of the iterative perturbation theory (ITP) of the dynamical mean field theory (DMFT) and coherent-potential approximation (CPA) is generalized to the double exchange model with orbital degeneracy. The Hubbard interaction and the off-diagonal components for the hopping matrix $t_{ij}^{mn} (m \ne n)$ are considered in our calculation of spectrum and optical conductivity. The numerical results show that the effects of the non-diagonal hopping matrix elements are important.

关键词: iterative perturbation theory, coherent-potential approximation, dynamical mean field theory, optical conductivity

Abstract: A combination of the iterative perturbation theory (ITP) of the dynamical mean field theory (DMFT) and coherent-potential approximation (CPA) is generalized to the double exchange model with orbital degeneracy. The Hubbard interaction and the off-diagonal components for the hopping matrix $t_{ij}^{mn} (m \ne n)$ are considered in our calculation of spectrum and optical conductivity. The numerical results show that the effects of the non-diagonal hopping matrix elements are important.

Key words: iterative perturbation theory, coherent-potential approximation, dynamical mean field theory, optical conductivity

中图分类号:  (Band and itinerant models)

  • 75.10.Lp
78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))