Models from scratch

[DFT_user]

Quantum physics is a first principles model as it can not be reduced to more fundamental contributions. At the level of material design, electrons and atoms’ nuclei are sufficient to describe the majority of phenomena, as further complexity (quarks and so forth) does not contribute in a significant way at the materials scale. Going to a larger scale, classical mechanics is still a first principles model as the interactions are described from fundamental laws of nature (even though, in general, the objects in study are a large arrange of atoms considered as a one entity). The same goes for classical electromagnetism, based on fundamental laws of nature (Ampere, Coulumb, etc.).

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