Theory of the Anderson Impurity Model: The Schrieffer–Wolff Transformation Reexamined
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چکیده
منابع مشابه
Theory of the Anderson Impurity Model: The Schrieffer–Wolff Transformation Reexamined
We test the method of infinitesimal unitary transformations recently introduced by Wegner on the Anderson single impurity model. It is demonstrated that infinitesimal unitary transformations in contrast to the Schrieffer Wolff transformation allow the construction of an effective Kondo Hamiltonian consistent with the established results in this well understood model. The main reason for this is...
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——————————————————————————————————————— Abstract We investigate the single-impurity Anderson model by means of the recently introduced modified perturbation theory. This approximation scheme yields reasonable results away from the symmetric case. The agreement with exactly known results for the symmetric case is checked, and results for the non-symmetric case are presented. With decreasing cond...
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We apply the method of innnitesimal unitary transformations recently introduced by Wegner 1] to the Anderson single impurity model. It is demonstrated that this method provides a good approximation scheme for all values of the on-site interaction U, it becomes exact for U = 0. We are able to treat an arbitrary density of states, the only restriction being that the hybridization should not be th...
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ژورنال
عنوان ژورنال: Annals of Physics
سال: 1996
ISSN: 0003-4916
DOI: 10.1006/aphy.1996.0123