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Perturbative renormalization group approach to magic-angle twisted bilayer graphene using topological heavy fermion model
Yi Huang, Yang-Zhi Chou, Sankar Das Sarma
https://arxiv.org/abs/2507.17751

Perturbative renormalization group approach to magic-angle twisted bilayer graphene using topological heavy fermion model
We develop a perturbative renormalization group (RG) theory for the topological heavy fermion (THF) model, describing magic-angle twisted bilayer graphene (MATBG) as an emergent Anderson lattice. The realistic parameters place MATBG near an intermediate regime where the Hubbard interaction $U$ and the hybridization energy $γ$ are comparable, motivating the need for RG analysis. Our approach analytically tracks the flow of single-particle parameters and Coulomb interactions within an energy win…