Strong electronic correlations pose one of the biggest challenges to solid state theory.
Recently developed methods that address this problem by starting with the local, eminently …

We review the dynamical mean-field theory of strongly correlated electron systems which is
based on a mapping of lattice models onto quantum impurity models subject to a self …

We review the quantum fidelity approach to quantum phase transitions in a pedagogical
manner. We try to relate all established but scattered results on the leading term of the …

The conjecture is verified that the optimum, energy minimizing, magnetic flux for a half-filled
band of electrons hopping on a planar, bipartite graph is π per square plaquette. We require …

We reconsider the conceptual foundations of the renormalization-group (RG) formalism, and
prove some rigorous theorems on the regularity properties and possible pathologies of the …

Abstract The familiar unrestricted Hartree-Fock variational principles is generalized to
include quasi-free states. As we show, these are in one-to-one correspondence with the one …

Abstract The Falicov-Kimball model was introduced in 1969 as a statistical model for metal-
insulator transitions; it includes itinerant and localized electrons that mutually interact with a …

Why another book on the renormalization of field theory? This book aims to contribute to the
bridging of the gap between the treatments of renor malization in physics courses and the …

In this contribution we present the exact solution of the Falicow-Kimball-model for large
dimensions and finite temperatures. We find the phase-transition, give an expression for the …

A new powder diffractometer aiming for high angular, and thus high reciprocal space,
resolution is being constructed within the Neutron Beam Instrumentation Project at the …