[超导国家重点实验室学术报告]二维自旋电子材料中的拓扑输运与磁电阻效应

二维自旋电子材料因其独特的层间自由度和丰富的自旋相关现象，成为探索新奇量子输运行为和发展高性能自旋电子器件的重要平台。本报告将介绍我们在该领域的最新进展。首先，我们通过自旋过滤效应实现了巨磁阻：利用A型反铁磁半导体构建串联自旋过滤器，获得超过8000%的磁电阻

[超导基础理论和实验技术系列讲座 (一百二十八) ]从宏观量子隧穿到超导量子比特

1962年，Brian Josephson从理论上预言超导Cooper对可以在被一层非常薄的绝缘体隔开的两个超导体之间相干地隧穿，从而电流可以无阻流过绝缘区。这一效应，称为Josephson效应，对超导的基础和应用研究都产生了极其重要的影响。Josephson效应可以理解为超导宏观波函数的隧穿效应，传统上也常被称为一种宏观量子效应。

[超导基础理论和实验技术系列讲座 (一百二十七) ]Prof. Ilya M. Eremin："Magnetic" Mechanism of Unconventional Superconductivity in Bilayer Nickelates: Multiorbital Effects

Recently discovered high-T_c superconductivity in pressurized bilayer nickelate bulk crystals La₃Ni₂O₇ (La-327) and their thin films under compressive strain are believed to be driven by the non-phononic repulsive interaction. Depending on the strength of the interlayer repulsion, the symmetry of the superconducting order parameter is expected to be either d-wave or sign-changing bonding-antibonding s±-wave order parameter, respectively. 

[超导基础理论和实验技术系列讲座 (一百二十六) ] 卢仲毅：关联电子材料的电子结构计算方法的发展和应用

基于密度泛函理论的电子结构计算（DFT）与动力学平均场理论（DMFT）相结合的DFT+DMFT电子结构计算方法是研究关联电子材料最有力和最有前景的方法。已有的DFT+DMFT由于量子蒙特卡洛杂质求解器的负符号问题而不能处理阻挫关联电子材料，而阻挫关联电子材料往往呈现许多奇异的量子物理现象。2014年我们提出自然轨道重正化群方法（NORG）。该方法非常适合处理多轨道多格点的量子杂质系统，并适合于作为动力学平均场理论的杂质求解器

[超导基础理论和实验技术系列讲座 (一百二十五) ] Prof. Ziqiang Wang：Extraordinary Superconducting Matter

n ordinary superconductors, an external magnetic field is needed to generate magnetic vortices. We discuss two examples where this conventional folklore breaks down. The first example is superconductors with strong spin-orbit coupling. We show that topological defect excitations, dubbed quantum anomalous vortex (QAV), can nucleate around magnetic ions spontaneously in the absence of external magnetic fields.

[超导基础理论和实验技术系列讲座 (一百二十四) ]袁辉球：量子相变与非常规超导

在重费米子等强关联电子材料体系中，磁场、压力、掺杂等非温度参量可以用来调控电荷、自旋、轨道、晶格等自由度间的耦合，诱导诸如非常规超导、奇异金属以及关联拓扑态等奇异电子性质，并可实现对不同量子态的调控，导致丰富的量子临界行为。

[超导基础理论和实验技术系列讲座 (一百二十三) ]Prof. Zhenyu Zhang：Helicity and Chirality in Quantum Materials

Helicity and chirality are fundamental and widespread phenomena in nature. In this talk, I attempt to cover several aspects of helicity and chirality in quantum materials, including helical or chiral structural formation out of achiral building blocks, chiral magnetic excitations in two-dimensional (2D) quantum magnets, and emergence of chiral phonons in otherwise achiral or nonmagnetic 2D lattices.

[超导国家重点实验室学术报告]Search for orbital magnetism in the kagome superconductor CsV₃Sb₅ using neutron diffraction

The kagome metal, CsV₃Sb₅, exhibits both a charge density wave phase below 94K with a 2x2 doubling of the unit cell and a superconducting phase below 2.5K. These materials also show strong anomalous Hall effect, but no spin ordering has been found in these materials both by muon spin spectroscopy and neutron diffraction. 

[超导国家重点实验室学术报告]Hidden Magnetic Texture in the Pseudogap Phase of the High-T_c YBa₂Cu₃O_6+x

In many quantum materials, strong electron correlations lead to the emergence of new states of matter. In particular, the study in the last decades of the complex phase diagram of high temperature superconducting cuprates highlighted intra-unit-cell electronic instabilities appearing at the pseudogap temperature. 

[超导基础理论和实验技术系列讲座 (一百二十一) ] 向涛：What is the problem of high-Tc superconductivity?

The discovery of high-temperature superconductivity has sparked numerous breakthroughs in physics, generated high expectations for practical applications, and posed substantial challenges to quantum theory.