As in many other branches of computational chemistry and materials science, periodic systems under pressure are commonly modeled using DFT. Due to the nature of the periodic wave function derived from Bloch's Theorem in such systems, plane-wave basis sets or, more precisely, the projector augmented wave (PAW) method by Blöchl, is typically applied instead of Gaussian Type Orbitals (GTOs) to model the wave function. However, it needs to be kept in mind that PAW calculations are in most cases computationally more expensive than GTO-based calculations.