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Chin. Phys. B, 2008, Vol. 17(6): 2277-2280    DOI: 10.1088/1674-1056/17/6/057

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

Liu Zi-Xina, Li Mingb, Wen Sheng-Huic
a Department of Physics , Henan Normal University, Xinxiang 453007, China; b Department of Physics , Nanjing University, Nanjing 210093, China; c Department of Physics, Henan Institute of Education, Zhengzhou 450014, China
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.
Keywords:  optical conductivity      iterative perturbation theory      coherent-potential approximation      dynamical mean field theory  
Received:  18 October 2007      Revised:  19 December 2007      Published:  20 June 2008
PACS:  75.10.Lp (Band and itinerant models)  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
Fund: 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).

Cite this article: 

Liu Zi-Xin, Wen Sheng-Hui, Li Ming Generalization of iterative perturbation theory and coherent potential approximation (ITP+CPA) to double exchange model with orbital degeneracy 2008 Chin. Phys. B 17 2277

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