报告题目：Surface chiral Abelian topological order on multilayer cluster Mott insulators
报告人：姚旭平 博士 （国科大卡弗里理论科学研究所）
报告时间：2026 年 7 月 6 日（周一） 14 : 00-16 : 00
报告地点：北洋园校区 49 教 410 室
报告摘要：
The surface states of a symmetry-protected topological (SPT) phase can exhibit a rich variety of possibilities. In this talk, I will show how multilayer-stacked cluster Mott insulating systems, combined with strong surface correlations, provide an ideal platform to realize this potential. Using first-principles calculations and parton mean-field theory, we propose a quantum spin liquid with a spinon Fermi surface on the surface of multilayer 1T‑TaS2, and, more remarkably, a chiral Abelian topological order on the surface of Nb3X8 (X = Br, Cl). We further suggest that angle-resolved photoemission spectroscopy (ARPES) can detect the spinon Fermi surface and the fractionalization of chiral Abelian topological order, respectively. The connection to real materials and recent experiments is discussed in detail. Our results are expected to inspire broad interest in emergent exotic correlation physics in cluster Mott insulating systems, as well as in the interplay between the two distinct branches of topological phases.
报告人简介：
Xu-Ping Yao is a postdoctoral fellow at the Kavli institute for theoretical sciences (UCAS). He received his B.S. from UESTC and his M.S. from Fudan University. After earning his Ph.D. from the University of Hong Kong in 2022, he worked as a postdoctoral researcher for one year before moving to the current position in 2023. His research interests primarily focus on strong correlation physics and quantum simulation.
