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This article describes CP2K, a comprehensive computational chemistry software package that integrates electronic structure calculations with molecular dynamics simulations and spectroscopic analysis. The software combines multiple methods ranging from classical force fields to highly accurate quantum mechanical approaches, enabling users to study molecular structures, energy landscapes, and dynamic processes. A key feature is its ability to compute spectroscopic properties through various approaches, including averaging over thermal configurations and time-correlation functions along molecular trajectories.
Why it matters
CP2K provides researchers with a unified computational platform for studying chemical systems across multiple scales and time domains, from static structures to dynamic processes and spectroscopic measurements. This versatility enables more accurate modeling of complex molecular phenomena in fields ranging from materials science to biochemistry, potentially accelerating drug discovery, catalyst design, and materials development.
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⚠️ Preprint – Noch nicht peer-reviewed
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Abstract: One of the distinguishing aspects of CP2K is its seamless integration of diverse structural and transition-state optimization techniques with advanced sampling approaches including Monte Carlo, molecular dynamics, and metadynamics, enabling the efficient exploration of complex potential- and free-energy landscapes, including rare events. These capabilities are combined with a broad hierarchy of energy and force evaluation methods, ranging from classical and machine-learned interaction potentials and mixed quantum-classical multiscale and semiempirical schemes, to highly accurate quantum-mechanical electronic-structure approaches. At the heart of the latter lies the Gaussian and plane-wave framework, along with its augmented all-electron generalization, which have been described in detail in our previous code review [T. D. K”uhne et al., J. Chem. Phys. 152, 194103 (2020)]. Building on this foundation, the present work revisits the methods within CP2K that turn electronic structure into dynamics, transport, and spectroscopic response. Particular emphasis is placed on the coupling between static response calculations and nuclear motion: spectra may be evaluated at optimized structures, averaged over thermally sampled configurations, obtained from time-correlation functions along ab-initio or path integral molecular trajectories, or followed in real time together with electronic and nuclear dynamics. The same modular structure also enables equilibrium and biased transport simulations, from Kubo-type linear response to open-boundary approaches under external potentials, highlighting CP2K’s unique capability to unify quantum chemistry with quantum and statistical mechanics within a versatile, holistic simulation environment.