divERGe implements various Exact Renormalization Group examples

SciPost Physics Codebases

Abstract

We present divERGe, an open source, high-performance C/C++/Python library for functional renormalization group (FRG) calculations on lattice fermions. The versatile model interface is tailored to real materials applications and seamlessly integrates with existing, standard tools from the ab-initio community. The code fully supports multi-site, multi-orbital, and non-SU(2) models in all of the three included FRG variants: TU ^2 2 FRG, N-patch FRG, and grid FRG. With this, the divERGe library paves the way for widespread application of FRG as a tool in the study of competing orders in quantum materials.

Authors 3

1. Jonas B. Profe Aachen Institute for Theory of Statistical Physics

   RWTH Aachen University · Jülich Aachen Research Alliance

   Affiliation as printed

   RWTH Aachen University

   Institute for Theory of Statistical Physics, RWTH Aachen University and

   JARA Fundamentals of Future Information Technology, Aachen, Germany

2. Dante Marvin Kennes Aachen Institute for Theory of Statistical Physics

   RWTH Aachen University · Jülich Aachen Research Alliance · Max Planck Institute for the Structure and Dynamics of Matter · Center for Free-Electron Laser Science

   Affiliation as printed

   Max Planck Institute for the Structure and Dynamics of Matter

   RWTH Aachen University

   Center for Free Electron Laser Science, Hamburg, Germany

   Institute for Theory of Statistical Physics, RWTH Aachen University and

   JARA Fundamentals of Future Information Technology, Aachen, Germany

   Max Planck Institute for the Structure and Dynamics of Matter,

3. Lennart Klebl corresponding

   Universität Hamburg

   Affiliation as printed

   University of Hamburg