报告人简介: Bernhard Keimer is Director of the Max Planck Institute for Solid State Research in Stuttgart, Germany. Before moving to Stuttgart, he spent seven years on the faculty of Princeton University, as a colleague of Daniel C. Tsui. He is well known for spectroscopic experiments that elucidate electronic correlations in quantum materials, and for developing strategies to control such correlations at interfaces. His scientific accolades include the Gottfried Wilhelm Leibniz Prize, the Heike Kamerlingh Onnes Prize, and two Advanced Grants of the European Research Council.

报告摘要: Forty years after its discovery, high-temperature superconductivity remains a cornerstone of modern condensed matter physics. Accumulating evidence – including the proximity of magnetically ordered phases and characteristic sign reversals of the superconducting order parameter – indicates that spin fluctuations serve as the primary pairing glue across copper-, nickel-, and iron-based superconductors. This lecture will highlight insights gained from the direct observation of spin fluctuations using momentum-resolved spectroscopic probes, specifically inelastic neutron scattering and resonant inelastic X-ray scattering (RIXS). After addressing theoretical challenges on the pathway toward a fully predictive framework, we will focus on Sr₂RuO₄ as a clean, minimally disordered model compound hosting an unconventional superconducting state. Notably, its critical temperature can be more than doubled under modest uniaxial pressure. Finally, we will present recent RIXS data that provide a compelling, quantitative test of magnetically mediated Cooper pairing in this highly tunable system. 

联系人：胡江平 研究员 （jphu@iphy.ac.cn）
　　　　高鸿钧 研究员（hjgao@iphy.ac.cn）