Kagome Hubbard model from a functional renormalization group perspective

Physical Review Research, vol. 6

Abstract

The recent discovery of a variety of intricate electronic order in kagome metals has sprouted significant theoretical and experimental interest. From an electronic perspective on the potential microscopic origin of these phases, the most basic model is given by a Hubbard model on the kagome lattice. We employ a functional renormalization group (FRG) to analyze the kagome Hubbard model. Through our methodological refinement of FRG both within its N -patch and truncated unity formulation, we resolve previous discrepancies of different FRG approaches [Wang , vs Kiesel , ], and analyze both the pure ( p -type) and mixed ( m -type) van Hove fillings of the kagome lattice. Published by the American Physical Society 2024

Authors 8

1. Jonas B. Profe corresponding Aachen

   Goethe University Frankfurt · RWTH Aachen University

   Affiliation as printed

   Goethe University Frankfurt

   RWTH Aachen University

2. Lennart Klebl

   Universität Hamburg

   Affiliation as printed

   Universität Hamburg

3. Francesco Grandi Aachen

   RWTH Aachen University

   Affiliation as printed

   RWTH Aachen University

4. Hendrik Hohmann

   University of Würzburg

   Affiliation as printed

   Universität Würzburg

5. Matteo Dürrnagel

   University of Würzburg · ETH Zurich

   Affiliation as printed

   ETH Zürich

   Universität Würzburg

6. Tilman Schwemmer

   University of Würzburg

   Affiliation as printed

   Universität Würzburg

7. Ronny Thomale

   University of Würzburg

   Affiliation as printed

   Universität Würzburg

8. Dante Marvin Kennes Aachen

   Max Planck Institute for the Structure and Dynamics of Matter · RWTH Aachen University

   Affiliation as printed

   Max Planck Institute for the Structure and Dynamics of Matter

   RWTH Aachen University