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The flat band has attracted a lot of attention because it gives rise to manyexotic phases, as recently demonstrated in magic angle twisted bilayergraphene. Here, based on first-principles calculations, we identify ametal-insulator transition in boron triangular Kagome lattice with aspin-polarized flat band at 2/3-filling. This phase transition is accompaniedby the formation of a Wigner crystal, which is driven by Fermi surface nestingeffect and thereby strong electron-phonon interactions, keeping ferromagnetism.Our calculation results suggest that boron triangular Kagome lattices withpartially filled flat bands may open a new playground for many exotic quantumphases in two-dimensional systems, such as Winger crystallization andfractional quantum Hall states.

A Metal-Insulator Transition via Wigner Crystallization in Boron Triangular Kagome Lattice