The nature of the orbital structure of the pairs in the superconducting phase of the high-
temperature superconducting cuprates remains one of the central questions in this field …

In materials with strong local Coulomb interactions, simple defects such as atomic
substitutions strongly affect both macroscopic and local properties of the system. A …

Electron Correlations in Molecules and Solids bridges the gap between quantum chemistry
and solid-state theory. In the first half of the text new concepts are developed for treating …

The GW approximation (GWA) extends the well-known Hartree-Fock approximation (HFA)
for the self-energy (exchange potential), by replacing the bare Coulomb potential v by the …

This review is an up-to-date snapshot of the current situation in studies of materials with
competing electron spectrum instabilities, namely Cooper pairing, on the one hand, and …

To understand the origin of superconductivity, it is crucial to ascertain the nature and origin
of the primary carriers available to participate in pairing,,,,,. Recent quantum oscillation …

This review deals with the properties of superconductors with competing electron spectrum
instabilities, namely, charge-density waves (CDWs) and spin-density waves (SDWs). The …

The pairing mechanism in high-Tc-superconductors (HTS) is still, 13 years after the
discovery of HTS, under dispute. However, there are experimental evidences that the …

This book provides the first systematic discourse on a very peculiar approach to the theory of
strongly correlated systems. Hubbard X-operators have been known for a long time but have …

We present the results of a quantum Monte Carlo study of the extended s and the dx 2− y 2
pairing correlation functions for the two-dimensional Hubbard model, computed with the …