报告题目：Artificial heavy fermion in Nb₃Cl₈/graphene heterostructure

报告时间：2025年5月8日（周四）15:30

报告地点：鼓楼校区唐仲英楼 B501

报  告 人：叶堉（北京大学）

报告摘要 : Heavy fermion systems, traditionally realized in rare-earth compounds with limited tunability, have hindered systematic exploration of correlated quantum phenomena. In this talk, we introduce a general strategy for engineering heavy fermions in incommensurate van der Waals heterostructures by coupling a Mott insulator (Nb₃Cl₈) with itinerant electrons (from monolayer graphene), circumventing strict lattice-matching requirements. Through magnetotransport and slave spin mean-field calculations, we demonstrate the hybridization gap (about 30 meV), gate-tunable metal-insulator transition, and band-selective electron effective mass enhancement, hallmarks of Kondo coherence. Top gate-temperature phase mapping and in-plane magnetic field-induced metal-insulator transitions reveal competing correlated states, including insulating and hidden-order phases. This work establishes a scalable platform for designing heavy fermion by replacing the itinerant electron materials, with implications for engineering topological superconductivity and quantum criticality in low-dimensional systems.

报告人简介：叶堉，北京大学物理学院博雅特聘教授。2012年获北京大学凝聚态物理博士学位。在2016年7月加入北京大学之前，在美国加州大学伯克利分校从事博士后研究工作。他所在的研究组(http://faculty.pku.edu.cn/yeyu)目前主要研究凝聚态物理中光与物质相互作用和电输运特性，重点通过纳米尺度器件设计、低温强磁场光谱学和电输运测量，研究原子级薄材料、范德华异质结构和表面/界面中出现的新奇物理现象。发表了100多篇研究论文，被引用10000余次，h因子为47。