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Physics Colloquium | Hua Wang 汪華: Nonlinear Optical Responses in Topological and Strong Correlated Systems
時間
2023年2月24日（周五）
16:00-17:30
地點
西湖大學云谷校區學術環E10-211教室
主持
西湖大學理學院講席教授 吳從軍 教授
受眾
全體師生
分類
學術與研究
Physics Colloquium | Hua Wang 汪華: Nonlinear Optical Responses in Topological and Strong Correlated Systems
時間：2023年2月24日（周五）下午16:00-17:30
Time:?16:00-17:30 , Friday, February 24th , 2023
主持人:?西湖大學理學院講席教授 吳從軍 教授
Host:?Prof.?Congjun?Wu, PI of School of Science, Westlake University
地點：西湖大學云谷校區E10-211教室
Venue:?E10-211, Yungu Campus,?Westlake?University
主講嘉賓/Speaker：
Dr.?Hua?Wang（汪華研究員）
PI of ZJU-Hangzhou Global Scientific and Technological Innovation Center
主講人簡介/Biography:
Dr. Hua Wang is a PI in ZJU-Hangzhou Global Scientific and Technological Innovation Center and an affiliated faculty member in School of Micro-Nano Electronics at Zhejiang University. He obtained his PhD in Materials Science at Texas A&M University in 2020 and became a postdoctoral researcher in the department of Nuclear Science & Engineering at MIT. He was elected to “2022西湖明珠工程”. His research focused on the microscopic theory and first-principles calculations of quantum materials with exotic properties, e.g., superconductivity, multiferroicity, topology, spintronics and nonlinear optics. He developed the first principles density functional theory based methods for nonlinear optical responses and proposed the ferroelectric nonlinear anomalous Hall effect and other nonlinear magneto-optic phenomena, e.g., magnetic shift and inject current, nonlinear Edelstein effect, and bulk spin photovoltaic effect. He published 44 papers in renowned journals such as Nat. Phys., Nat. Nano., Sci. Adv., JACS, Nat. Comm., PRL, PRX, AM.
講座摘要/Abstract:
In this talk, I would like to present our recent theoretical effort on understanding and predicting the nonlinear response in topological and strong correlated systems. First, I will present our work on nonlinear photocurrent in PT-symmetric magnetic topological quantum materials. Second, I will show that ferroelectric nonlinear anomalous Hall effect can be achieved in time-reversal invariant few-layer WTe2 by utilizing the intrinsic coupling between nonlinear susceptibility and quantum geometry of electronic states, paving a theoretical foundation for nonlinear quantum memory such as Berry curvature memory. Third, I will briefly introduce our Green’s function approach to nonlinear optical responses and demonstrate the nontrivial topological surface states will induce abnormal nonlinear charge and spin photocurrents in low frequency regime. Finally, I will discuss our recent study on nonlinear optical responses in the Mott flat band systems.?
講座聯系人/Contact:
理學院?張老師?zhangyue62@trinapockett.com
