|
Diagram theory for the twofold-degenerate Anderson impurity model
V. A. Moskalenkoab, L. A. Dohotaruc, D. F. Digorb, I. D. Chebotar'b a Joint Institute for Nuclear Research, Dubna, Russia
b Institute of Applied Physics, Academy of Sciences of
Moldova, Chisinau, Moldova
c Technical University, Chisinau, Moldova
Abstract:
We develop a diagram technique for investigating the twofold-degenerate Anderson impurity model in the normal state with the strong electronic correlations of d electrons of the impurity ion taken into account. We discuss the properties of the Slater–Kanamori model of d electrons. After finding the eigenfunctions and eigenvalues of all 16 local states, we determine the local one-particle propagator. We construct the perturbation theory around the atomic limit of the impurity ion and obtain a Dyson-type equation establishing the relation between the impurity electron propagator and the normal correlation function. As a result of summing infinite series of ladder diagrams, we obtain an approximation for the correlation function.
Keywords:
strong correlated electron system, Dyson equation, Green's function, Anderson impurity model.
Received: 24.01.2013 Revised: 18.06.2013
Citation:
V. A. Moskalenko, L. A. Dohotaru, D. F. Digor, I. D. Chebotar', “Diagram theory for the twofold-degenerate Anderson impurity model”, TMF, 178:1 (2014), 131–146; Theoret. and Math. Phys., 178:1 (2014), 115–129
Linking options:
https://www.mathnet.ru/eng/tmf8501https://doi.org/10.4213/tmf8501 https://www.mathnet.ru/eng/tmf/v178/i1/p131
|
Statistics & downloads: |
Abstract page: | 338 | Full-text PDF : | 187 | References: | 69 | First page: | 27 |
|