题目：Mott Physics at Doping: Elephant in the Living Room

报告人：翁征宇

邀请人：史明

时间：2025年4月25日（周五）下午13:30

地点：紫金港校区海纳苑8幢215报告厅

摘要：

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.  

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个人简介：

翁征宇，清华大学高等研究院教授。1978年考入中国科大少年班，1987年在中国科大物理系获博士学位。在休斯顿大学和德州超导中心做博士后和任研究职位多年。2001年加入清华大学高等研究院（中心），2004年任杨振宁讲席教授。目前主要研究方向与兴趣：凝聚态物理理论尤其是量子多体强关联系统的研究，包括各种emergent现象特别是非常规高温超导机理的探索。