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)
a Department of Physics , Henan Normal University, Xinxiang 453007, China; bDepartment of Physics, Henan Institute of Education, Zhengzhou 450014, China; cDepartment of Physics , Nanjing University, Nanjing 210093, 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.
Received: 18 October 2007
Revised: 19 December 2007
Accepted manuscript online:
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(刘自信), Wen Sheng-Hui(文生辉), and Li Ming(李明) 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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