27 citations · 90 across the 7 of their papers we have counts for
7 papers
Extension of dynamical mean-field theory by inclusion of nonlocal two-site correlations with variable distance
Torben Jabben, Norbert Grewe, Sebastian Schmitt
We present a novel approximation scheme for the treatment of strongly correlated electrons in arbitrary crystal lattices. The approach extends the well-known dynamical mean field t…
Spectral properties of the two-impurity Anderson model with varying distance and various interactions
Torben Jabben, Norbert Grewe, Sebastian Schmitt
We present a novel approximation for two interacting magnetic impurities immersed into a noninteracting metallic host. The scheme is based on direct perturbation theory in the hybr…
Itinerant and local-moment magnetism in strongly correlated electron systems
Sebastian Schmitt, Norbert Grewe, Torben Jabben
Detailed analysis of the magnetic properties of the Hubbard model within dynamical mean-field theory (DMFT) is presented. Using a RPA-like decoupling of two-particle propagators we…
Dynamic susceptibilities of the single impurity Anderson model within an enhanced non-crossing approximation
Sebastian Schmitt, Torben Jabben, Norbert Grewe
The single impurity Anderson model (SIAM) is studied within an enhanced non-crossing approximation (ENCA). This method is extended to the calculation of susceptibilities and thorou…
Multi-orbital Anderson models and the Kondo effect
Norbert Grewe, Torben Jabben, Sebastian Schmitt
The low energy region of certain transition metal compounds reveals dramatic correlation effects between electrons, which can be studied by photoelectron spectroscopy. Theoretical…
Conserving approximations in direct perturbation theory: new semianalytical impurity solvers and their application to general lattice problems
Norbert Grewe, Sebastian Schmitt, Torben Jabben +1
For the treatment of interacting electrons in crystal lattices approximations based on the picture of effective sites, coupled in a self-consistent fashion, have proven very useful…