报告题目 (Title)：Unraveling Electron-Phonon Coupling in Novel Superconducting Materials: From Vanadium-based Kagome Superconductors to Nickelate Superconductors（揭示新型超导材料中的电子-声子耦合：从钒基笼目超导体到镍基超导体）

报告人 (Speaker)：尤景阳 博士后（南加州大学）

报告时间 (Time)：2024年5月10日（周五）10:00

报告地点 (Place)：校本部 G213

邀请人 (Inviter)：孙硕 副教授

主办部门：理学院物理系

报告摘要：

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.