Broadening the Spectrum: Extending the Finite Crystal Method to Characterize Static Multi-Atomic Active Metamaterial Systems

This paper introduces novel applications of the “finite crystal method” to assess the stability of multi-atomic static active metamaterial systems exhibiting negative static polarizability. While this method has conventionally been applied to systems assuming positive static polarizability and more recently to monoatomic systems with negative static polarizability, its application to multi-atomic systems represents a unique contribution. This work demonstrates the method's adaptability to a more general case with systems composed of multiple atoms per primitive cell and multiple types of atoms, illustrated with the help of a diatomic system.