报告题目：The Role of Symmetry in Low-Dimensional Magnetic Materials

报告人：陈鸿燕 博士（卡尔斯鲁厄理工学院）

邀请人：蒋尚达 教授

时间：2023年9月26日15:30 - 17:00

地点：广州国际校区 C2a-201

欢迎广大师生踊跃参加。

自旋科技研究院

2023年9月22日

报告摘要：

The field of low-dimensional magnetism is a diverse and dynamic area of research that encompasses a wide range of topics, spanning from fundamental physics to practical applications. These studies are of great significance for advancing disciplines such as materials science, spintronics, and quantum information. However, the reduction in size typically introduces side effects, notably significant deviations in magnetic behavior, as well as the potential loss of stability and functionality in magnetic materials.

In this talk, I will showcase two entirely distinct magnetic materials: complex oxide thin films (2D) and single molecular magnets (0D). What makes this intriguing is that, despite belonging to different material systems, these two materials share a common physical quantity that influences their magnetic properties, namely, ‘symmetry’ (or symmetry breaking). Firstly, I will use La_0.7Sr_0.3MnO₃ /SrTiO₃ (LSMO/STO) ultrathin films as an example to demonstrate the pivotal role of lattice symmetry in governing the interaction among charge, orbital, and spin orderings in complex systems, especially under low-dimensional conditions. Subsequently, at the molecular level, I will show how crystal field symmetry plays a role in determining and stabilizing molecular spin, both in 3d-transition-metal-based molecules and 4f-rare-earth based molecules, as well as spin crossover (SCO) complexes. All these results demonstrate the significance of symmetry in fundamental physics and shed lights on the role of symmetry strategies in the design and furthermore, fine-tuning of magnetic systems.

报告人简介：

Hongyan Chen is currently a postdoctoral researcher at Physikalisches Institut, Karlsruhe Institute of Technology, Germany. She received her bachelor’s degree in physics from Xiamen University in 2013, and doctoral degree in condensed matter physics from Fudan University in 2019. She then joined Prof. Wulfhekel’s research group as a postdoctoral scholar in 2019 and has been working there ever since. Her research interests focus on low-dimensional magnetism, including complex magnetic ultrathin films and molecule-based magnets, as well as strong-correlated materials. Specifically, molecular physics at surfaces, on-surface reading and controlling of single molecular spin, and interaction of magnetism and superconductivity.