6 papers
Absence of the diffusion pole in the Anderson insulator
V. Janis, J. Kolorenc
We discuss conditions for the existence of the diffusion pole and its consequences in disordered noninteracting electron systems. Using only nonperturbative and exact arguments we…
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…
Failure of Fermi-Liquid Theory at Strong Coupling
Vaclav Janis
We investigate quantitatively the effects of strong electron-electron coupling onto the dynamics of lattice electrons. To that purpose the self-consistent version of the bubble-cha…
Anderson-Hubbard Model in
M. Ulmke, V. Janis, D. Vollhardt
We present a detailed, quantitative study of the competition between interaction- and disorder-induced effects in electronic systems. For this the Anderson-Hubbard model with diago…