Strong electronic correlations are often associated with the proximity of a Mott-insulating
state. In recent years however, it has become increasingly clear that the Hund's rule …

Conventional band structure calculations in the local density approximation (LDA)[1–3] are
highly successful for many materials, but miss important aspects of the physics and …

We show that in multiband metals the correlations are strongly affected by Hund's rule
coupling, which depending on the filling promotes metallic, insulating or bad-metallic …

We investigate the Mott transitions in two-band Hubbard models with different bandwidths.
Applying dynamical mean field theory, we discuss the stability of itinerant quasiparticle …

The electronic properties of paramagnetic V 2 O 3 are investigated by the computational
scheme LDA+ DMFT (QMC). This approach merges the local density approximation (LDA) …

It is shown how, in multiband materials, the Hund's coupling plays a crucial role in tuning the
degree of electronic correlation. While in half-filled systems it enhances the correlations, in …

We generalize the rotationally invariant formulation of the slave-boson formalism to
multiorbital models, with arbitrary interactions, crystal fields, and multiplet structure. This …

Alkali-doped fullerides have attracted strong interest since their production became possible
about fifteen years ago. This book presents recent work which may solve intriguing problems …

We introduce a representation of electron operators as a product of a spin-carrying fermion
and of a phase variable dual to the total charge (slave quantum rotor). Based on this …

The computation scheme merging the local density approximation and the dynamical mean-
field theory (DMFT) is employed to calculate spectra both below and above the Fermi energy …