Non-Abelian multiband topology, characterized by frame charges, has garnered significant attention in the past few years. The non-Abelian frame charge evolution can be deduced from the rotation of the multiband in momentum space, which can promise potential applications based on the dynamic non-Abelian topological effects. In this work, based on two-dimensional phononic crystals, we directly observe the eigenstate frame rotation to verify non-Abelian band topology, which further predicts the location of the corner modes in this multigap system. These one-dimensional edge states of band gaps or...
