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 …

A review of the basic ideas and techniques of the spectral density-functional theory is
presented. This method is currently used for electronic structure calculations of strongly …

We propose a two-orbital Hubbard model on an emergent honeycomb lattice to describe the
low-energy physics of twisted bilayer graphene. Our model provides a theoretical basis for …

Describing all aspects of the physics of transition metal compounds, this book provides a
comprehensive overview of this unique and diverse class of solids. Beginning with the basic …

Using t 2 g Wannier functions, a low-energy Hamiltonian is derived for orthorhombic 3 d 1
transition-metal oxides. Electronic correlations are treated with a new implementation of …

The multiorbital Hubbard model is expressed in terms of quantum phase variables (“slave
rotors”) conjugate to the local charge, and of auxiliary fermions, providing an economical …

We outline a general mechanism for orbital-selective Mott transition, the coexistence of both
itinerant and localized conduction electrons, and show how it can take place in a wide range …

A single-site dynamical mean-field study of a three band model with the rotationally invariant
interactions appropriate to the t 2 g levels of a transition metal oxide reveals a quantum …

We examine whether the Mott transition of a half-filled, two-orbital Hubbard model with
unequal bandwidths occurs simultaneously for both bands or whether it is a two-stage …

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 …