講座主題：Pairing mechanism and related problems in multilayer nickelates
專(zhuān)家姓名：楊帆
工作單位：北京理工大學(xué)物理學(xué)院
講座時(shí)間：2025年08月30日 14:30-15:30
講座地點(diǎn)：科技館1511
主辦單位：煙臺(tái)大學(xué)物理與電子信息學(xué)院
內(nèi)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.
主講人介紹：
楊帆，北京理工大學(xué)物理學(xué)院教授。2002年博士畢業(yè)于北京大學(xué)物理學(xué)院，2004年從清華大學(xué)高等研究中心博后出站，之后加入北京理工大學(xué)物理學(xué)院。2013年被聘為教授。楊帆的主要研究方向?yàn)閺?qiáng)關(guān)聯(lián)和超導(dǎo)理論。曾長(zhǎng)期在銅基超導(dǎo)、量子自旋液體和鐵基超導(dǎo)領(lǐng)域展開(kāi)研究。近期的研究興趣集中在魔角石墨烯、準(zhǔn)晶電子態(tài)和鎳基超導(dǎo)等領(lǐng)域。發(fā)表論文80余篇，被引3000余次。
