Title: Magic angle of moire magnetic materials
Abstract: Recent experiments with twisted bilayer materials have provided a versatile platform for realizing exotic phases of matter. Among many interesting physical features, the emergence of the flatband in magic-angle twisted bilayer graphene(MATBG) is known as the source of a strong correlation effect. In this talk, we show that magnetic materials can also harbor the flatband of magnons. In sharp contrast to the electronic flatband at the Fermi level, the relevant energy level of the magnon(bosonic) flatband is zero energy. Therefore, the magnon flatband demands a completely different recipe for its realization from the case of the twisted bilayer graphene. We discuss the realization of magnonic flatband in twisted bilayer magnetic materials.