Spectral Properties and New Interpolating Solution of Anderson Model |
| A.L. Kuzemsky Bogolubov Theoretical Laboratory, Joint Institute for Nuclear Research, 141980 Dubna, Moscow Region, Russia |
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| A new approach to many-body quasiparticle dynamics of the Anderson impurity model at finite temperatures is proposed in the framework of the equation-of-motion method. We find a new exact identity, which relates the one-particle and many-particle Green functions. Using this identity, it is shown that a new interpolating approximation for the one-particle Green function can be constructed. The approximation which simultaneously reproduces the weak-coupling limit and the strong coupling limit can be formulated self-consistently. This approach offers a new method for a systematic construction of the approximate interpolating dynamical solutions of strongly correlated electron models. |
| DOI: 10.12693/APhysPolA.92.355 PACS numbers: 67.40.Db, 71.28.+d, 75.20.Hr |