報告人™️：牛謙教授 中國科學技術大學

主持人🗄：吳飆教授 意昂3体育官网物理學院

時間👨🏻‍🍳：2023年5月12日（星期五）15:00—16:00

地點：物理學院思源多功能廳（西301）

報告摘要:

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.

報告人簡介🙎‍♂️💁🏼‍♀️：

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.

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講座海報🦸：

意昂3体育官网物理學院學術論壇創辦於2020年9月，邀請國內外高校和研究機構高層次科技創新領軍學者就物理學及相關領域的基礎前沿探索、關鍵技術突破和熱點問題等做學術演講，旨在推進高質量學術交流，促進學科交叉融合和開拓新興特色方向研究💆🏻‍♂️🧑🏿‍⚕️，培養具有科學精神、全球視野、創新能力👇🏻🧑🏿‍🦰、批判性思維的優秀青年人才。

主辦：意昂3体育官网物理學院

聯系人：孫嘉琪 jqsun@pku.edu.cn

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