Spectral Functions of Correlated Electron Systems in the Local Impurity Self Consistent Approximation
نویسندگان
چکیده
We describe the evolution of the spectral density as we dope a Mott insulator within a dynamical mean field method. After giving an intuitive description of this Local Impurity Self-Consistent Approximation (LISA) for a model with several orbitals per unit cell, we illustrate its implementation in the context of the Hubbard model in infinite dimensions. For this purpose a new iterative perturbation theory (IPT) scheme is introduced and compared with results from exact diagonalization.
منابع مشابه
Multitier self-consistent GW+EDMFT
We discuss a parameter-free and computationally efficient ab initio simulation approach for moderately and strongly correlated materials, the multitier self-consistent GW+EDMFT method. This scheme treats different degrees of freedom, such as high-energy and low-energy bands, or local and nonlocal interactions, within appropriate levels of approximation, and provides a fully self-consistent desc...
متن کاملSpectral Properties of the Anderson Impurity Model: Comparison of Numerical Renormalization Group and Non–Crossing Approximation
A comparative study of the numerical renormalization group and non– crossing approximation results for the spectral functions of the U = ∞ Anderson impurity model is carried out. The non–crossing approximation is the simplest conserving approximation and has led to useful insights into strongly correlated models of magnetic impurities. At low energies and temperatures the method is known to be ...
متن کاملLocal electronic structure of a single magnetic impurity in a superconductor
The electronic structure near a single classical magnetic impurity in a superconductor is determined using a fully self-consistent Koster-Slater algorithm. Localized excited states are found within the energy gap which are half electron and half hole. Within a jellium model we find the new result that the spatial structure of the positive-frequency (electron-like) spectral weight (or local dens...
متن کاملاثر آلاییدگی درون وجهی اتم کربن بر طول پیوندها در ساختار بلوری fcc-C60
Single and double equilibrium bond lengths of the fcc-C60 crystal were calculated in the absence and presence of the endohedral C atom as an impurity doped into each C60 cluster, i.e., fcc-C@C60, by means of fully-relaxed self-consistent calculations within the density functtional theory (DFT) employing the full potential-augmented plane waves plus local orbital (FP-APW+lo) method. The result s...
متن کاملSUPER- AND SUB-ADDITIVE ENVELOPES OF AGGREGATION FUNCTIONS: INTERPLAY BETWEEN LOCAL AND GLOBAL PROPERTIES, AND APPROXIMATION
Super- and sub-additive transformations of aggregation functions have been recently introduced by Greco, Mesiar, Rindone and v{S}ipeky [The superadditive and the subadditive transformations of integrals and aggregation functions, {it Fuzzy Sets and Systems} {bf 291} (2016), 40--53]. In this article we give a survey of the recent development regarding the existence of aggregation functions with ...
متن کامل