Variational Theory for Two-Impurity Anderson Model
نویسندگان
چکیده
منابع مشابه
The asymmetric single - impurity Anderson model – the modified perturbation theory
——————————————————————————————————————— 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...
متن کاملSpectral Density of the Two-Impurity Anderson Model
We investigate static and dynamical ground-state properties of the twoimpurity Anderson model at half filling in the limit of vanishing impurity separation using the dynamical density-matrix renormalization group method. In the weakcoupling regime, we find a quantum phase transition as function of inter-impurity hopping driven by the charge degrees of freedom. For large values of the local Coul...
متن کاملInterpolative approach for solving the Anderson impurity model
S. Y. Savrasov,1 V. Oudovenko,2,5 K. Haule,3,5 D. Villani,4,5 and G. Kotliar5 1Department of Physics, New Jersey Institute of Technology, Newark, New Jersey 07102, USA 2Laboratory for Theoretical Physics, Joint Institute for Nuclear Research, 141980 Dubna, Russia 3Jožef Stefan Institute, SI-1000 Ljubljana, Slovenia 4JP Morgan Chase Bank, 270 Park Avenue, New York, New York 10017, USA 5Departmen...
متن کاملNon-Fermi-liquid theory of a compactified Anderson single-impurity model.
We consider a version of the symmetric Anderson impurity model (compactified) which has a non-Fermi liquid weak coupling regime. We find that in the Majorana fermion representation the perturbation theory can be conveniently developed in terms of Pfaffian determinants and we use this formalism to calculate the impurity free energy, self energies, and vertex functions. We also derive expressions...
متن کاملDiagrammatic Theory of the Anderson Impurity Model with Finite Coulomb Interaction
Abstract We developed a self-consistent conserving pseudo particle approximation for the Anderson impurity model with finite Coulomb interaction, derivable from a Luttinger Ward functional. It contains an infinite series of skeleton diagrams built out of fully renormalized Green’s functions. The choice of diagrams is motivated by the Schrieffer Wolff transformation which shows that singly and d...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1992
ISSN: 0033-068X,1347-4081
DOI: 10.1143/ptp/87.2.331