4 papers · 1 filter
Kondo behavior in the asymmetric Anderson model: Analytic approach
V Janis, P. Augustinsky
The low-temperature behavior of the asymmetric single-impurity Anderson model is studied by diagrammatic methods resulting in analytically controllable approximations. We first dis…
Dynamical electron correlations in metals: TB-LMTO and multiband Hubbard Hamiltonian
V. Drchal, V. Janis, J. Kudrnovsky
We study electronic properties of solids with correlated d electrons which could be described by a multiband Hubbard Hamiltonian in the weak-interaction case, . The one-elec…
Strongly correlated electrons: Dynamical vertex renormalization
Vaclav Janis
Single-band Hubbard model at criticality of the metal-insulator transition is studied using approximations derived from parquet theory. It is argued that only the electron-hole and…
Generating functional for the full parquet approximation
Vaclav Janis
Parquet diagrams sum self-consistently Feynman graphs for the vertex function with all two-particle multiple scatterings. We show how the complete parquet equations for the Hubbard…