【时   间】2023年12月14日（周四）上午 10：00

【地   点】量子院526会议室

【报告人】周毅（中科院物理研究所研究员）

【主   持】徐洪起（量子院量子计算研究部执行部长，北京澳门威尼克斯人网站讲席教授）

【题   目】Multiple-Q pair density wave in proximity to a nested Fermi surface

【摘  要】We show that spontaneous time-reversal-symmetry (TRS) breaking can naturally arise from the interplay between pair density wave (PDW) ordering at multiple momenta and nesting of Fermi surfaces (FS). Concretely, we consider the PDW superconductivity on a hexagonal lattice with nested FS at 3/4 electron filling, which is related to a recently discovered superconductor CsV3Sb5. Because of nesting of the FS, each momentum on the FS has at least two counterparts on the FS to form finite momentum Cooper pairs, resulting in a TRS and inversion broken PDW state with stable Bogoliubov Fermi pockets. Possible implications to the Kagome superconductor CsV3Sb5 and future experiments will be discussed.

【报告人简介】Yi Zhou is a professor at Institute of Physics, Chinese Academy of Sciences. He received his B.S. degree and Ph. D. in physics from Tsinghua University in 1998 and 2004 respectively. After postdoctoral journey, he became a faculty member in Zhejiang University in 2009 and moved to current position in 2019. His main research interests include quantum many-particle physics and theoretical condensed matter physics.