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SUMMARY:Nonadiabatic phonon spectra and their implications in various materials – Nina Girotto Erhardt
DESCRIPTION:Join us at the next Colloquium@T2P on\nNonadiabatic phonon spectra and their implications in various materials\nNina Girotto Erhardt\nInstitute of Condensed Matter and Nanosciences, Université catholique de Louvain, Belgium\nEmail: nina.girotto@uclouvain.be ( mailto:nina.girotto@uclouvain.be )\n\nThe talk will only be broadcast via Zoom:\nhttps://hu-berlin.zoom-x.de/j/63217651382?pwd=1satvcVjx4fLfnCjKlkdLBj8eowKLP.1 ( https://hu-berlin.zoom-x.de/j/63217651382?pwd=1satvcVjx4fLfnCjKlkdLBj8eowKLP.1 )\nAbstract:\nWe will delve into the role of dynamical electron-phonon coupling and provide an overview of the consequences the nonadiabatic effects have on material properties. Using examples of several bulk and two-dimensional materials, we will show how the nonadiabatic effects appear in their phonon spectra and renormalize superconducting temperature prediction, total electron-phonon coupling strength, temperature dependence of electron scattering rate, and help us understand phase diagrams. We will then tackle some cases in which we need to go beyond the first-order dynamical electron-phonon coupling. For MgB2, higher-orders of electron-phonon coupling affect its whole phonon spectrum, especially its temperature-dependence. The real strength of these higher-order, or electron-mediated anharmonic effects, lies in their ability to capture large broadening contributions for longwavelength phonons, crucial to explain temperature-dependent Raman spectra in graphene. Further, they also renormalize the temperature of soft-mode instability in TiSe2 and doped MoS2, improving our understanding of electron-phonon fluctuations in charge-density wave materials.\n \n
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