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►【超导基础理论和实验技术系列讲座(87)】

报告题目：Intertwined Orders in the Cuprate Superconductor and the Underlying Organization Principle

报告人：翁征宇  教授   

           清华大学高等研究院

报告时间：2019年11月06日（周三）下午14:00-16:00

报告地点: 中科院物理所M楼234

报告摘要：

A sensible phenomenology of the complex phase diagram and rich phenomenon in the high-Tc cuprate calls for a microscopic understanding based on general principles. In this talk, I will identify a set of the most essential organization principles for the doped Mott insulator, which are argued to have captured the fundamental physics of the cuprate superconductor. Then I will exemplify their nature as the exotic long-range entanglement of many-body quantum mechanics by using the exact numerical tools of exact diagonalization and density matrix renormalization group, which are applied to some special cases of finite size/limited geometry to demonstrate the consequences of the general principle. Next, I will focus on the phase diagram relevant to the experiments in the cuprate, and show that it may be unified by a “parent”ground state ansatz constructed based on the organization principles. Here the superconducting state is of non-BCS nature with modified London equation and new elementary excitations. In particular, the two-gap structure and dichotomy between the nodal and antinodal regimes in the superconducting state, the origin of Fermi arc in the pseudogap regime, and the strange metal behavior in the high-temperature regime will be discussed as part of the emergent phenomenon.

报告人简介：

翁征宇，清华大学教授。1987年于中国科大获博士学位。在美国德州超导中心担任研究职位多年。2001年加入清华大学高等研究院。现在主要研究兴趣与方向：凝聚态理论尤其是强关联物理的研究，量子多体系统的emergent物理现象研究与高温超导机理探索。