[超导基础理论和实验技术系列讲座（八十八）] Studies of superconductors using microwave technique

I will introduce several examples of studies of superconductor using microwave complex conductivity measurement, together with techniques developed for those purposes.  More explicitly, the followings are the list of the subject I am going to talk.

[超导基础理论和实验技术系列讲座（八十七）] Intertwined Orders in the Cuprate Superconductor and the Underlying Organization Principle

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.

[超导基础理论和实验技术系列讲座（八十六）] 扫描隧道谱和量子杂质探测非常规超导体电子配对机制

扫描隧道显微镜和隧道谱是基于量子力学的隧道效应而研发的原子分辨的探测仪器。其测量结果除了能够显示原子相，一级倒数dI/dV曲线能够给出局域电子态密度在空间的分布，二级倒数d2V/dI2能够给出电子与其他玻色子的相互作用。我将从量子力学的隧道效应和超导体的单电子隧道效应出发，介绍隧道显微镜和隧道谱在研究非常规超导机制中的应用。

[超导基础理论和实验技术系列讲座（八十五）] Recent Progress in Two-dimensional Superconductors

Two-dimensional (2D) superconductors have become an important platform to study high Tc superconductivity and novel quantum physics. After a brief introduction to superconductivity and 2D superconductivity, I would like to talk about the recent progress in experimental studies for 2D crystalline superconductors. The topics are mainly focused on quantum metal state, quantum Griffiths singularity, Ising superconductivity, interface superconductivity, high Tc and topological superconductivity. [1-8]

[超导基础理论和实验技术系列讲座（八十四）] 拓扑序材料——有量子记忆的材料：理论和实验

有很长一段时间，大家觉得材料所有不同的相和它们之间的相变，都是由朗道的对称性破缺理论来描写的。在1989年研究高温超导体中自旋液体的时候，我们在理论上发现了新的量子物态，它并不能被朗道的对称性破缺理论所描述。这一发现表明，对称性破缺理论并不能描述所有的相，一个没有预料到的一个新大陆出现在大家眼前。这一类新量子物态中的结构被称之为拓扑序。这一报告将系统介绍拓扑序，及其新奇的性质和相关的概念。包括：拓扑绝缘体没有拓扑序，量子自旋霍尔效应没有量子化的自旋霍尔效应，马约拉纳费米子不是马约拉纳的费米子，等等。

[超导基础理论和实验技术系列讲座（八十三）] 高温超导材料实用化进展与挑战

[超导基础理论和实验技术系列讲座（八十二）] 超导薄膜的制备与高温超导机理研究

[超导基础理论和实验技术系列讲座（八十一）] CALYPSO凝聚态结构预测方法及其在高压相富氢化合物超导体上的应用

[超导基础理论和实验技术系列讲座（八十）] 关联电子材料的高压同步辐射研究

高压科学和现代同步辐科学的结合极大推进了多个学科领域的进步和发展，其中也包含了对凝聚态物理中电子强关联体系的研究。压力作为一种清洁的、理论上相对透明的调制手段,可以有效地调节改变电子强关联体系中的的各种竞争作用，而衍生出新的物理现象规律；而现代同步辐射和高压环境的有机结合，使得这些新的物理现象被更有效地观测和研究，从而开辟了一个新的研究领域。本讲座将概括地介绍当前高压关联电子材料的研究现状，以及我近几年来组利用第三代同步辐射技术取得一些典型的成果。最后着重介绍我们在高温超导体Bi2212取得的最新成果。

[超导基础理论和实验技术系列讲座（七十九）] Combinatorial Approach to Materials Discovery,Machine Learning, and Topological Superconductor