Multiorbital Tight-Binding Modeling and Electron Correlation Effects in “135” Kagome Metals AV₃Sb₅

The “135” kagome metal family exhibits a fascinating interplay of emergent electronic phenomena, including unconventional charge density wave (CDW) order and superconductivity. In this work, we introduce a multi-orbital tight-binding framework that robustly reproduces features of the low-energy band structure, such as the Fermi surfaces, double p-type van Hove singularities, and multiorbital character. Building on this foundation, we implement extended Hubbard model and perform mean-field calculations to investigate electron correlation effects, revealing the microscopic mechanisms underlying symmetry-breaking CDW states in AV₃Sb₅ compounds.