In the early 1970s, Wilson developed the concept of a fully nonperturbative renormalization
group transformation. When applied to the Kondo problem, this numerical renormalization …

In the first half of this article, theoretical treatments of the infrared divergence involved in the
edge problem of soft-x-ray absorption, emission, and photoemission spectra of simple …

Thermodynamic properties are presented for four magnetic impurity models describing the
scattering of fermions from a localized orbital at an energy-dependent rate Γ (ε) which …

The multichannel Kondo model exhibits non-Fermi-liquid behavior in the overscreened
case, when the number of channels, k, is greater than twice the size of the impurity spin, s …

A procedure that calculates excitation properties for the Anderson model is reported and
applied to photoemission. In the mixed-valence regime, hybridized in the ground state, the …

The renormalization-group method developed by Wilson to calculate thermodynamical
properties of dilute magnetic alloys is generalized to allow the calculation of dynamical …

The many-body problem is usually approached from one of two perspectives: the first
originates from an action and is based on Feynman diagrams, the second is centered …

Local three-and four-point correlators yield important insight into strongly correlated systems
and have many applications. However, the nonperturbative, accurate computation of …

We generalize the spectral sum rule preserving density matrix numerical renormalization
group (DM-NRG) method in such a way that it can make use of an arbitrary number of not …

The full-density-matrix numerical renormalization group has evolved as a systematic and
transparent setting for the calculation of thermodynamical quantities at arbitrary …