»ã±¨±êÌâ (Title)£ºUnraveling Electron-Phonon Coupling in Novel Superconducting Materials: From Vanadium-based Kagome Superconductors to Nickelate Superconductors£¨½ÒʾÐÂÐͳ¬µ¼×ʲÂÖеĵç×Ó-Éù×ÓñîºÏ£º´Ó·°»ùÁýÄ¿³¬µ¼Ìåµ½Äø»ù³¬µ¼Ì壩

»ã±¨ÈË (Speaker)£ºÓȾ°Ñô ²©Ê¿ºó£¨ÄϼÓÖÝ´óѧ£©

»ã±¨¹¦·ò (Time)£º2024Äê5ÔÂ10ÈÕ£¨ÖÜÎ壩10:00

»ã±¨µØÖ· (Place)£ºÐ£±¾²¿ G213

Ô¼ÇëÈË (Inviter)£ºËï˶ ¸±½ÌÊÚ

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Understanding the interplay between phonons and many-body correlated electrons is crucial for elucidating exotic phases and defining material properties in condensed matter physics. Electron-phonon (e-ph) coupling, a fundamental concept in this field, exerts significant influence on various phenomena, including superconductivity, charge-density waves, and thermal properties. This presentation is grounded in the advanced first-principles method known as GW perturbation theory (GWPT), which effectively captures electron-phonon (e-ph) coupling in the presence of electron correlations, going beyond the commonly used methods based on density functional theory. Our research aims to address two key questions: firstly, to explore the influence of phonons on superconductivity and photoemission kinks in V-based kagome superconductors, and secondly, to scrutinize the evolution of e-ph coupling in nickelate superconductors across different family members. We unveil that the multimodal and gapless superconductivity in CsV3Sb5 originates from the same e-ph interaction mechanism, and shed light on the distinct e-ph landscape of the high-temperature superconductor La3Ni2O7 compared to infinite nickelates superconductors.