题目：Mottness, Pseudogap and Spectral Weight Transfer in Strongly Correlated Systems

报告人：李建新

邀请人：袁辉球、刘洋

时间：2024年5月17日（周五）14:00-15:15

地点：紫金港校区海纳苑8幢215报告厅

摘要：

Understanding unconventional metallic phases such as pseudogap phase and strange metal presents a challenge in strongly correlated physics. Moir´e systems, with wide tunability, have provided a new platform for investigating this issue, as demonstrated by a recent observation of a strange metal regime near the Mott transition in twisted WSe2.

I this talk, I will report our recent theoretical finding of two pseudogap states with Fermi arc and Fermi pocket in the triangular moir´e Hubbard model via the change of the displacement field at half-filling, respectively. These pseudogap phases, as proximate states of the Mott insulator, are non-Fermi liquids resulting from intrinsic strong correlations, which is elaborated by the coexistence of poles and zeros of the Green's function. I will also talk about our recent elaboration of a new type of spectral weight transfer (SWT) in the magnetic-field response of the Mott insulator at half filling and its application to tWSe2.

个人简介：

李建新，南京大学物理学院教授。1993年于武汉大学获博士学位。1993年起于南京大学历任博士后、副教授、教授。先后在台湾中研院物理研究所、美国加州大学伯克利分校从事一年的访问研究。2005年获国家杰出青年科学基金。2009-2011年曾受聘为教育部长江学者特聘教授。主要从事强关联电子系统、低维量子自旋系统以及非常规超导物理的理论研究。理论预言了笼目晶格体系在范霍夫奇点填充时具有手征超导性、建立了Kitaev量子磁体α-RuCl₃的最小有效自旋模型以及阐明了拓扑绝缘体电子关联导致的量子相变等。