报告题目： Low-Dimensional Spin Lattices in Mott-Insulating Nanographenes

报 告 人： 赵晨晓（粤港澳大湾区量子科学中心）

报告时间： 2026年3月20日（星期五）上午10:00

报告地点： 清华大学物理楼 W105

报告摘要：Our recent research on the π-electron magnetism in nanographene lattices, lying in the half-filling Mott-insulating phase, offers promising pathways for realizing low-dimensional spin systems with remarkable structural stability, scalability, and sufficiently large exchange coupling strengths. In this talk, I will mainly focus on the π-electron magnetism in graphene, starting with its origin and underlying principles. Building on this foundation, I will discuss how we used scanning tunneling microscopy (STM) to achieve precise control over spin states in magnetic nanographenes [1]. Finally, I will demonstrate how on-surface synthesis allowed us to covalently link these magnetic nanographene building blocks, enabling the construction of diverse spin chains with tailored properties [2,3]. Their ground state properties have been characterized by inelastic electron tunneling spectroscopy with both spatial and energy resolution. Our ability to integrate various building blocks and site-specific spin manipulation with STM offers a unique playground to explore the relationship between different spin phases, and collective excitations like spinons and triplons [2–4].

参考文献

[1] Zhao, Chenxiao, et al. Tailoring Magnetism of Graphene Nanoflakes via Tip-Controlled Dehydrogenation. Physical Review Letters 132.4 (2024): 046201.
[2] Zhao, Chenxiao, et al. Tunable topological phases in nanographene-based spin-1/2 alternating-exchange Heisenberg chains. Nature Nanotechnology (2024): 1–7.
[3] Zhao, Chenxiao, et al. Spin excitations in nanographene-based antiferromagnetic spin-1/2 Heisenberg chains. Nature Materials (2025): 1–6.
[4] Henriques, J. C. G., et al. Determining Energy Dispersion of Spin Excitations with Scanning Tunneling Spectroscopy. Physical Review Letters 135.9 (2025): 096703.

报告人简介：赵晨晓，粤港澳大湾区量子科学中心量子物态与新量子效应研究部副研究科学家，国家高层次青年人才计划入选者。2015年获西南大学物理学学士学位，2020年获上海交通大学物理学博士学位，2021至2025年在瑞士联邦材料科学与技术研究院担任博士后研究员。主要研究方向为纳米石墨烯中的π电子结构、低维磁性、拓扑材料与超导异质结。研究成果发表于 Nature Materials、Nature Nanotechnology、Physical Review Letters、JACS 等期刊。