Formation of Cavity-Polaritons via High-Order Van Hove Singularities
The research explored creating cavity-polaritons by engineering non-parabolic band structures to achieve a high-order Van Hove singularity (HOVHS) in the joint density of states at a material's band gap. By using a checkerboard lattice, they found this method enhances light-matter hybridization, leading to a lower polaritonic branch with zero absorption and significant energy shifts.