Kagome Hubbard model from a functional renormalization group perspective
Jonas B. Profe, Lennart Klebl, Francesco Grandi, Hendrik Hohmann, Matteo Dürrnagel, Tilman Schwemmer, Ronny Thomale, Dante M. Kennes
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 <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:mrow> <a:mi>N</a:mi> </a:mrow> </a:math> -patch and truncated unity formulation, we resolve previous discrepancies of different FRG approaches [Wang , vs Kiesel , ], and analyze both the pure ( <b:math xmlns:b="http://www.w3.org/1998/Math/MathML"> <b:mi>p</b:mi> </b:math> -type) and mixed ( <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mi>m</c:mi> </c:math> -type) van Hove fillings of the kagome lattice. Published by the American Physical Society 2024