From semi–classical swings to tad–poles: the Electron–Phononproblem as the devil in the details of Many–Body Theory

From semi–classical swings to tad–poles: the Electron–Phononproblem as the devil in the details of Many–Body Theory

Munich (Germany), 2025, 30 January

Electrons and phonons are basic concepts, considered as the most elemental and well defined example of fermions and bosons. So it may appear that their formal properties are clear and well established. In reality, despite books and reviews the theory of electron-phonon interaction (EPI) is still very much debated. The reason is mostly historical. Indeed the state-of-the art theoretical and numerical approach to the EPI has been built on top of two popular methods: model Hamiltonians and Density Functional Perturbation Theory (DFPT).

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