题 目：Microstructured Quantum Matter Utilizing FIB Technique

报告人：郭春煜副研究员，德国马克斯·普朗克物质结构与动力学研究所（MPSD）

时间：2024年10月24日（周四）上午9:30

地点：国家脉冲强磁场科学中心C204

报告摘要：

My talk will focus on three key aspects of our research: 1) Force-free microstructures host intrinsic dynamics of orbital phases in AV₃Sb₅ Kagome metals^[1-3]. I will review our recent development of a force-free approach based on FIB micromachining. This enables the identification of field-switchable chiral electronic transport^[1-2] and “fragile” electronic symmetry in these Kagome superconductors^[3].2) Quasi-symmetry-protected topology in a chiral semi-metal CoSi. Quasi-symmetry is an alternative guiding principle we introduced for the hunt of topological materials. These topological near-degeneracies act as giant sources of Berry curvature that are robust against perturbations^[4]. On the contrary, the exact degeneracy protected by crystalline symmetry can be lifted by perturbations such as strain or magnetic field, leading to a deconstructive quantum interference. This represents a direct physical consequence of quantum geometry^[5]. 3) Ballistic and hydrodynamic transport in ultra-clean quantum materials. I will discuss the latest theoretical development of an innovative experimental setup for capturing distinct signatures of the hydrodynamic flow of charge carriers^[6].

[1] Chunyu Guo et al., Nature 611, 461(2022).

[2] Chunyu Guo et al., Quantum Materials 9, 20 (2024).

[3] Chunyu Guo et al., Nature Physics 20,579 (2024).

[4] Chunyu Guo et al., Nature Physics 18, 813 (2022).

[5] Chunyu Guo et al., In preparation (2024).

[6] Kaize Wang et al., arXiv:2409.16088 (2024)

报告人简介：

Chunyu Guo is a research group leader in the Department of Microstructured Quantum Matter at the Max-Planck Institute of the Structure and Dynamics of Matter (MPSD). In 2019, he received a PhD degree from the Department of Physics and Center for Correlated Matter at Zhejiang University for his experimental work on topological correlated matter. From 2019 to 2022, he worked as a postdoc researcher in Prof. Philip J. W. Moll’s group at the Swiss Federal Institute of Technology Lausanne. He extended his research towards the micromachining of strongly correlated materials utilizing the focused-ion-beam technique. In 2022, he moved to Hamburg, Germany, and became a research group leader at MPSD ever since. His research interests include Kagome materials, topological semimetals, strongly correlated electronic systems, and hydrodynamic transports. In 2024, he was awarded an ERC Starting Grant by the European Research Council for his project entitled “Force-free microstructures host intrinsic dynamics of orbital phases in AV₃Sb₅ Kagome metals (Free-Kagome)”.