主讲人：陈钢 博雅特聘教授（北京大学国际量子材料中心）

题目：Thermal Hall effects in quantum magnets

时间：2024年7月9日（周二）下午15：00

地 点：理工楼1215

腾讯ID:489 636 635

联系人：赵继泽

报告摘要：

In the recent years, the thermal Hall transport has risen as an important diagnosis of the physical properties of the elementary excitations in various quantum materials, especially among the Mott insulating systems where the electronic transports are often featureless. Here we review the recent development of thermal Hall effects in quantum magnets where all the relevant excitations are charge-neutral. In addition to summarizing the existing experiments, we pay special attention to the underlying mechanisms of the thermal Hall effects in various magnetic systems, and clarify the connection between the microscopic physical variables and the emergent degrees of freedom in different quantum phases. The external magnetic field is shown to modify the intrinsic Berry curvature properties of various emergent and/or exotic quasiparticle excitations in distinct fashions for different quantum systems and quantum phases, contributing to the thermal Hall transports. These include, for example, the conventional ones like the magnons in ordered magnets, the triplons in dimerized magnets, the exotic and fractionalized quasparticles such as the spinons and the magnetic monopoles in quantum spin liquids. We discuss their contribution and their presence in the thermal Hall conductivity in different physical contexts.

个人简介：

Prof Chen is currently a professor of physics at international center for quantum materials of Peking University. Previously, he was a professor at the University of Hong Kong. He received his PhD degree at University of California Santa Barbara in 2010. He is mainly interested in strongly correlation physics, and has made some contributions to the fields of quantum magnetism, correlated electrons, itinerant frustration, topological materials, mesoscopic physics as well as ultracold atoms. He was awarded 2017 Daniel Tsui fellowship and 2018 Qiushi outstanding youth scientist.