本学期学术活动

物理系colloquium:Laser ARPES Study of High Temperature Superconductors

2024-12-02    点击:

报告题目:Laser ARPES Study of High Temperature Superconductors

报  告 人:周兴江,中国科学院物理研究所

报告时间:2024年12月5日16:00  

报告地点:理学院郑裕彤大讲堂

内容摘要The superconductivity mechanism in high temperature superconductors remains a prominent and challenging issue in condensed matter physics. Angle-resolved photoemission spectroscopy (ARPES) plays a key role in probing the electronic structure, many-body effect and superconducting gap structure of these superconductors. In this talk, I will report our recent laser-based ARPES studies of the cuprate superconductors, iron-based superconductors and newly discovered nickel-based superconductors. We developed a new approach that makes ARPES able to measure not only the superconducting gap size but also the gap sign [1]. We determined that the pairing symmetry is of the nodal s+-(G-M) type in iron-based superconductor KFe2As2 which has only hole pockets [2]. We found ubiquitous coexisting electron couplings with both the 40 meV and 70 meV modes in cuprate superconductors [3]. We revealed the electronic origin of high-Tc maximization in trilayer cuprate superconductors [4]. We resolved the electronic structures of La3Ni2O7 and found orbital-dependent electron correlations [5]. These results provide key insights in understanding superconductivity mechanism and also pave a way to further enhance Tc in these high temperature superconductors.

[1]. Qiang Gao, L. Zhao, X. J. Zhou et al., Nature Communications 15, 4538 (2024).

[2]. Dingsong Wu, Lin Zhao, X. J. Zhou et al., Nature Physics 20, 571 (2024).

[3]. Hongtao Yan, X. J. Zhou et al., PNAS 120, e2219491120 (2023).

[4]. Xiangyu Luo, X. J. Zhou et al., Nature Physics 19, 1841 (2023).

[5]. Jiangang Yang, L. Zhao, X. J. Zhou et al., Nature Communications 15, 4373 (2024).

报告人简介:周兴江,中国科学院物理研究所研究员。1988年清华大学学士。1990年清华大学硕士,1994年中国科学院物理研究所博士。1995-1997年德国斯图加特马普固体研究所洪堡学者,1997-2006年为美国斯坦福大学物理学者兼美国劳仑斯Berkeley国家实验室先进光源束线科学家,2004年入选中国科学院百人计划,2009-2022年任超导国家重点实验室主任。长期从事凝聚态物理实验研究,自主研制系列真空紫外激光角分辨光电子能谱仪,在高温超导体和其它量子材料的研究中做出了重要工作。发表SCI论文270多篇,论文被引用13000余次。2003年获美国Berkeley国家实验室的 David A. Shirley“杰出科学成就”奖,2005年获国家级人才基金资助,  2008年获首届周光召基金会“杰出青年基础科学奖”,  2009年获中国物理学会“胡刚复物理奖”, 2013 年获全球华人物理和天文学会“亚洲成就奖”, 2015 年获国家自然科学二等奖, 2015 年获第三世界科学院TWAS 物理奖,2016 年入选美国物理学会会士。