The renormalization group plays an essential role in many areas of physics, both
conceptually and as a practical tool to determine the long-distance low-energy properties of …

For decades, frustrated quantum magnets have been a seed for scientific progress and
innovation in condensed matter. As much as the numerical tools for low-dimensional …

Numerous correlated electron systems exhibit a strongly scale-dependent behavior. Upon
lowering the energy scale, collective phenomena, bound states, and new effective degrees …

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

Technological progress in material synthesis, as well as artificial realization of condensed
matter scenarios via ultra-cold atomic gases in optical lattices or epitaxial growth of thin …

Overthepastdecade, the? owequationmethodhasdevelopedintoanewv-satile theoretical
approach to quantum many-body physics. Its basic concept was conceived independently …

We study the ground-state properties of the two-dimensional spin-1/2 J 1-J 2 Heisenberg
model on a square lattice, within diagrammatic approximations using an auxiliary-fermion …

Using a leading algorithmic implementation of the functional renormalization group (fRG) for
interacting fermions on two-dimensional lattices, we provide a detailed analysis of its …

We use the Matsubara functional renormalization group (FRG) to describe electronic
correlations within the single impurity Anderson model. In contrast to standard FRG …

We describe a method to continue the fermionic renormalization group flow into phases with
broken global symmetry. This method does not require a Hubbard-Stratonovich decoupling …