报告人：牛谦教授 中国科学技术大学

主持人：吴飙教授 北京大学物理学院

时间：2023年5月12日（星期五）15:00—16:00

地点：物理学院思源多功能厅（西301）

报告摘要:

I will present a world view for electrons in crystals based the semiclassical dynamics and describe how the Berry curvatures modify the thermodynamic and transport properties. I will then extend this point of view to spacetime crystals by introducing the concept of an event wavepacket, the quantum version of the classical event point in spacetime. I will also describe spatial and temporal deformation, first in 3d crystals, using a geodynamic language, and obtain Hall viscosity, flexsoelectric and flexsomagnetic responses. When the results are extended to 4d spacetime crystals, the geodynamics becomes greatly simplified andunified, allowing a fresh look of table-top general relativity.

报告人简介：

Qian Niu is a Distinguished Chair Professor at the University of Science and Technology of China. He obtained his B.S. from Peking University in 1981 and his Ph.D. in physics from the University of Washington, Seattle, in 1985. After completing postdoc studies at the University of Illinois and the University of California, Santa Barbara, he joined the University of Texas at Austin as an Assistant Professor in 1990. He was appointed as the Trull Centennial Chair in Physics in 2001 and became the Sid W. Richardson Foundation Regents Chair in Physics at the University of Texas at Austin in 2018. Prof. Niu has made foundational contributions to the theories of quantum Hall effects, quasicrystals, ultracold atoms, spin transport, and graphene materials, with an emphasis on topological and geometric phase effects in quantum transport. He has published more than 280 peer-reviewed papers, including 81 in Physical Review Letters, and has over 29000 citations (with an H index of 77). Prof. Niu is also a Fellow of the American Physical Society.

现场参会报名：请于5月12日12:00前提交报名信息

直播信息详见海报

讲座海报：

北京大学物理学院学术论坛创办于2020年9月，邀请国内外高校和研究机构高层次科技创新领军学者就物理学及相关领域的基础前沿探索、关键技术突破和热点问题等做学术演讲，旨在推进高质量学术交流，促进学科交叉融合和开拓新兴特色方向研究，培养具有科学精神、全球视野、创新能力、批判性思维的优秀青年人才。

主办：北京大学物理学院

联系人：孙嘉琪 jqsun@pku.edu.cn

附大海报：