报告人：Alexander A. Golubov 教授 （MIPT）

时 间：2025年11月26日（周三）10:00~11:00

地 点：良乡校区，物理实验中心229会议室

摘要：

Superconductivity, characterized by zero resistance and the expulsion of magnetic fields, exhibits remarkable new behavior when coupled with other materials. This talk offers a pedagogical introduction to the physics of hybrid structures, focusing on Superconductor/Normal Metal (S/N) and Superconductor/Ferromagnet (S/F) junctions. We will begin by discussing the superconducting proximity effect, the cornerstone of these systems, where Cooper pairs penetrate into the adjacent material. In a normal metal, this induces a "softened" superconducting state, governed by the physics of Andreev reflection and the formation of a minigap in the density of states. The situation becomes dramatically different when the superconductor is coupled to a ferromagnet. Here, the exchange field of the ferromagnet imposes a strong spin-splitting, creating a fundamental antagonism with spin-singlet Cooper pairing. We will discuss how this leads to oscillatory and damped superconducting order parameters and the potential realization of the Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) state. Furthermore, we will touch upon the generation of long-range spin-triplet supercurrents in certain S/F heterostructures, a key ingredient for superconducting spintronics. We will connect these fundamental concepts to their implications for emerging technologies, including phase-coherent devices and cryogenic memory.

简历：

Prof. Dr. Alexander A. Golubov graduated in 1983 from the Department of Physical Chemistry at the Moscow Institute of Steel and Alloys (now the National University of Science and Technology MISIS, Rusia). He obtained his Ph.D. in 1987 and his Doctor of Science (habilitation) degree in 1997 from the Institute of Solid State Physics, Russian Academy of Sciences, Chernogolovka. From 1997 to 2024, he was a professor at the University of Twente, the Netherlands. He is currently a Professor and Head of Laboratory at the Moscow Institute of Physics and Technology, Russia. His research interests include the theory of electronic transport in superconductors, superconducting spintronics, and the physics of unconventional and topological superconductivity. Elected a Fellow of the American Physical Society in 2021, he has authored over 400 publications in international journals and holds an h-index of 59.

联系方式：xiangli@bit.edu.cn

邀请人： 李翔 教授

网 址：http://physics.bit.edu.cn/

承办单位：物理学院、先进光电量子结构设计与测量教育部重点实验室