【直播】【江苏省青年物理学家论坛】华科大付英双教授:Tailoring artificial Kondo lattice…

学术   2024-10-13 00:01   安徽  



江苏省青年物理学家论坛
Tailoring artificial Kondo lattice in van der Waals monolayer crystals

2024年10月15日 12:00


由江苏省物理学会主办,南京大学物理学院承办的江苏省青年物理学家论坛继续开讲。2024年10月15日,论坛邀请到来自华中科技大学物理学院付英双教授作题为“Tailoring artificial Kondo lattice in van der Waals monolayer crystals”的报告,详情如下。


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报告人介绍






付英双

付英双,华中科技大学物理学院教授,2008年于中国科学院物理研究所获凝聚态物理博士学位,2008-2011年在德国汉堡大学做博士后,2011-2014年在日本理化学研究所任国际特别研究员,2014年加入华中科技大学物理学院。2014年入选国家青年人才计划,2015年获得基金委优秀青年基金资助。主要研究方向为低维量子体系的控制生长与关联电子结构的扫描隧道谱学表征和调控。在Nature Physics、Nature Communications、PRX、PRL、JACS、NSR等期刊上发表论文近七十篇。作为项目负责人主持科技部重点研发计划物态调控项目和大科学装置前沿研究项目,以及基金委重大研究计划重点项目等。



报告摘要


The heavy fermion physics is dictated by subtle competing exchange interactions, posing a challenge for their understanding. Conventional heavy fermion systems are found in three-dimensional f-electron materials, which is complicated by the crystal and electronic structures. Artificial heavy fermions not only offer new systems that are simple in structure, but also may add desired functionalities. In this talk, I will present our recent progress in realizing artificial heavy fermions in van der Waals monolayer crystals or heterostructures that were grown with molecular beam epitaxy. Utilizing low temperature spectroscopic imaging scanning tunneling microscopy, we observed switching behavior of correlated gap in monolayer 1T-NbSe2 showing star-of-David (SD) charge density wave (CDW) pattern. Upon decreasing Se flux, a new quasi-1D CDW order emerges as caused by the incorporation of regularly spaced defect lines introduced into the SD motifs. Coherent Kondo screening is established along stripes, forming a long-sought quasi-1D Kondo lattice at the monolayer limit. We further build a heterostructure composed of half-layer NbSe and 1H-NbSe2, and observed nano-sized Kondo insulators, known as Kondo droplet, whose gap size increases with the decreasing size of the NbSe flakes. This uncovers how the Kondo interactions can be tailored by the finite size of the Kondo droplet. We also succeeded in constructing a 2D Kondo lattice composed of monolayer VSe2 grown on superconducting NbSe2, which indicates evident signatures of superconducting heavy fermions via proximity effect from the substrate. Our study realizes artificial Kondo lattices with tailored dimensionality, establishing connection between the heavy fermion physics and 2D materials with desired functionalities.

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