报告题目：Tunneling into the Pesudogap Phase of Cuprate
Superconductor
报 告 人： 杜增义，合肥国家实验室研究员，中国科学技术大学未来技术学院博士生导师。
时 间：2023年12月28日(周四)10:00
地 点：安徽大学磬苑校区材料科学大楼B401报告厅
主办单位：材料科学与工程学部
报告摘要：In the first part of my talk, I will list evidences supporting the existence of a Pair Density Wave (PDW) state in the pesudogap phase of cuprate. We observed a modulating superconducting gap with 8-unit-cell spatial periodicity in Bi2Sr2CaCu2O8+δ by using the Spectroscopic Imaging-Scanning Tunneling Microscopy (SI-STM) technique, proving the presence of a PDW order in this system. We also observed local density of states modulating at 4-unit-cell and 8-unit-cell periodicities along the Cu-O-Cu bond directions. These density of states modulations can be understood as a coupling of the PDW order with itself and d-wave superconductivity respectively. Then, I will present how the atomic lattice in Bi2Sr2CaCu2O8+δ is coupled to the CDW order in the pseudogap phase. We directly visualize a spatial modulation of the lattice distortion that has the same periodicities with the CDW orders, and furthermore we find that the lattice distortion is always locked-in with CDW order in the spatial phase distribution. Overall, our visualization of the PDW states and strong electron-lattice interactions here will help uncover the mysterious pesudogap phase of the cuprate.
杜增义简介：杜增义，合肥国家实验室研究员，中国科学技术大学未来技术学院博士生导师。2017年博士毕业于南京大学物理学院，导师为闻海虎教授。2018-2023年先后在美国布鲁克海文国家实验室、石溪大学从事博士后研究，课题方向为高温超导体的扫描隧道显微镜研究，以第一作者身份发表文章在Nature、Nature Physics、Nature Communications、Physical Review X等杂志上。2023获得国家级青年人才引进项目支持，加入合肥国家实验室和中国科学技术大学封东来院士团队，计划开发新型扫描探针显微技术和发展扫描近场光学显微镜技术，用以探究量子材料中光与物质在纳米尺度下的相互作用。
欢迎各位老师、同学届时前往！