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• 12:42, 25 February 2025 Jona talk contribs created page Construction:Category:Phonons (Created page with "Phonons are the collective excitation of nuclei in an extended periodic system. Here we will present a short summary with the complete derivation presented on the theory page. Let us start by making the Taylor expansion of the total energy <math>E </math> in terms of the ionic displacement <math> u_{I\alpha} = R_{I\alpha} - R^0_{I\alpha} </math> around the equilibrium positions of the nuclei <math>R^0_{I\alpha}</math> :<math> E(\{\mathbf{R}\})= E(...")