(6月24日)吴一鸣 研究员:双层镍酸盐中自旋条纹和超导性的起源
广东省磁电物性分析与器件重点实验室学术讲座(第八十六期)
报告人:
吴一鸣研究员(浙江大学)
题目:
双层镍酸盐中自旋条纹和超导性的起源
地点:
时间:
2026年6月24日(星期三)上午10:00
严忠波 教授
报告简介:
The bilayer nickelate La3Ni2O7 has recently emerged as a high-temperature superconductor with unusual spin stripe order in its ambient pressure phase. We propose a microscopic Hamiltonian that faithfully reflects the crystalline symmetry of this system, with the primary aim of addressing its unconventional magnetism at ambient pressure. Using state-of-the-art density matrix renormalization group calculations, we show that (π/2,π/2) spin stripe order arises in our model at sizable Hund's coupling JH from a hidden quasi-one-dimensionality and persists over a range of electron concentrations. In the more symmetric high-pressure regime, our model exhibits enhanced interlayer pairing tendencies when the interlayer antiferromagnetic coupling J⊥ becomes sufficiently large. Our results provide a microscopic origin of the diagonal spin stripes and identify Hund's coupling JH and interlayer coupling J⊥ as key ingredients governing magnetic order and pairing tendencies in La3Ni2O7.
报告人简介:
吴一鸣,浙江大学物理高等研究院百人计划研究员,博士生导师。本科毕业于北京大学,博士毕业于明尼苏达大学(导师Andrey Chubukov)。2021年到2022年在清华大学高等研究院从事水木学者博士后(合作导师姚宏),2022年到2026年在斯坦福大学担任Moore学者博士后(合作导师Steven Kivelson以及Srinivas Raghu)。研究方向为凝聚态理论,主要关心电子体系中由于关联效应导致的新奇物态及其性质,例如非常规超导、磁序,配对密度波,分数陈绝缘体等。


