讲座主题：Pairing mechanism and related problems in multilayer nickelates
专家姓名：杨帆
工作单位：北京理工大学物理学院
讲座时间：2025年08月30日 14:30-15:30
讲座地点：科技馆1511
主办单位：99精品视频在线观看物理与电子信息学院
内容摘要：
The high-temperature superconductivity discovered recently in the Ruddlesden-Popper (RP) phase multilayer superconductors has aroused great research interests. In this talk, I will first make a brief introduction over the experimental progress, and then report our series of works obtained through adopting both weak-coupling approach and strong-coupling one, for the bilayer and related RP- phase superconductors. In the weak-coupling aspect, we adopt the random-phase approximation approach to study the pairing symmetry and magnetic properties both at ambient pressure and under high pressure, with part of the results consistent with experiments. In the strong-coupling aspect, we propose that the SC under high pressure is carried by theorbital, and that the orbital also plays an important role through the Hund’s rule coupling. Based on this viewpoint, we construct the orbital bilayer model for , and use it to obtain the interlayer s-wave pairing nature. We further propose effective approaches to enhance the Tc. Finally, we discuss the relation between the results of the two approaches.
主讲人介绍：
杨帆，北京理工大学物理学院教授。2002年博士毕业于北京大学物理学院，2004年从清华大学高等研究中心博后出站，之后加入北京理工大学物理学院。2013年被聘为教授。杨帆的主要研究方向为强关联和超导理论。曾长期在铜基超导、量子自旋液体和铁基超导领域展开研究。近期的研究兴趣集中在魔角石墨烯、准晶电子态和镍基超导等领域。发表论文80余篇，被引3000余次。
