Local moment approach to the Anderson impurity model with spin-dependent hybridization
* SPEAKERS
Name
Affiliation
E-mail
Choong H. Kim
SNU
hychoi(at)skku.edu
* HOST(Applicant)
Name
Affiliation
E-mail
-
* DATE / TIME
2007-03-31, 12:00 – 12:20a.m.
* PLACE
Rm # 1423, 4th floor, KIAS
* ABSTRACT
We report an extended local moment approach (LMA) method for the solution of the Anderson impurity model with spin-dependent hybridization, which may be useful as an impurity solver within the framework of dynamical mean-field theory (DMFT). The two self-energy description, originally proposed by Logan and co-workers, is extended for the case with spin-dependent hybridization, where the generalized version of the
symmetry restoration condition is required. The self-consistent ground state is determined through the variational minimization of the ground state energy with respect to several self-consistent solutions. As a trial case, we applied our method to the quantum dot system coupled to ferromagnetic leads. The qualitative features of results are found to be in good agreement with the numerical renormalization group method. Since this approach is numerically efficient and transparent, it is hoped that the LMA can be extended to the multi-orbital case, which is necessary for the practical LDA-DMFT calculations.
