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CREATED:20260130T135825Z
DTSTAMP:20260130T140640Z
SUMMARY:CSMB Colloquium@T²P
DESCRIPTION:
X-ALT-DESC;FMTTYPE=text/html:<h3>Nonadiabatic phonon spectra and their implications in various materials</h3><p><strong>Nina Girotto Erhardt</strong><br>Institute of Condensed Matter and Nanosciences, Université catholique de Louvain, Belgium</p><h4><i>Abstract:</i></h4><p>We 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 MgB<sub>2</sub>, 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 TiSe<sub>2</sub> and doped MoS<sub>2</sub>, improving our understanding of electron-phonon fluctuations in charge-density wave materials.</p>
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<p>The talk will only be broadcast via <a href="https://hu-berlin.zoom-x.de/j/63217651382?pwd=1satvcVjx4fLfnCjKlkdLBj8eowKLP.1" target="_blank" title="Link to the Zoom event" rel="noreferrer">Zoom</a>.</p>
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