Time： 14:00-15:30, Thursday, April 3rd, 2025

时间：2025年4月3日（星期四）14:00-15:30

Host: Prof. Wei Zhu, PI of School of Science, Westlake University

主持人: 西湖大学物理系PI 朱伟

Venue: E10-215, Yungu Campus, Westlake University

地点: 云谷校区E10-215教室

Lecture Language: English

讲座语言: 英文

翁征宇教授

清华大学

主讲人/Speaker：

Zhengyu Weng is a professor at the Institute of Advanced Study, Tsinghua University. In 1978, he was admitted to the Junior Class of University of Science and Technology of China, and in 1987, he obtained a doctorate from the Department of Physics of University of China of Science and Technology of China. He has served as a postdoctoral and research position at the University of Houston and the Texas Superconductivity Center for many years. He joined the Institute of Advanced Study of Tsinghua University in 2001 and served as Yang Zhenning's Chair Professor in 2004. Current main research directions and interests: condensed matter physics theory, especially the study of quantum multi-body strongly correlated systems, including the exploration of various emerging phenomena, especially unconventional high-temperature superconducting mechanisms.

摘要/Abstract:

In the Landau paradigm for conventional metals, the Fermi statistics is essential to organize the electrons into a Fermi liquid or superconducting condensate. However, in a strongly correlated electron system with opening up a Mott gap, the Hilbert space is fundamentally changed with a new sign structure emerging to replace the Fermi signs. To illustrate the novel consequences, I will discuss the single-hole and two-hole wavefunctions as the simplest possible examples, which can account for all the nontrivial features as measured by exact numerical calculations. The variational numerical results show how the basic physics of a doped Mott insulator is radically changed from what one would expect from a Landau quasiparticle picture or a BCS pairing mechanism. Finite doping case in connection to the high-Tc problem in the cuprate will be also briefly discussed.

讲座联系人/Contact:

School of Science, Zeyuan LI, Email: lizeyuan@westlake.edu.cn