李丹枫助理教授 [香港城市大学]

Title: Superconductivity in Thin-film Infinite-layer Nickelates

Language:  Chinese presentation with English slides

Time: 13:30 - 15:00 PM, Friday, June 7, 2024

Place: Onsite：Conference room A417, HPSTAR (Beijing)            Online: Tencent Meeting: https://meeting.tencent.com/dm/0oqk0nwZ2tuS  Meeting ID: 741-624-491

Host:  Dr. Liling Sun

Abstract:

The recent discovery of superconductivity in infinite-layer nickelates has engendered reviving interest in the study of a cuprate-analog system [1]. Notably, superconducting nickelates display signatures of intriguing similarities and distinctions to the cuprates in their phase diagrams, proximity to strongly correlated electronic phases [2,3], antiferromagnetic interactions [4], superconducting anisotropy [5], etc. Partially owing to the non-trivial challenges in materials synthesis and their thin-film nature, experimental demonstration of the intrinsic properties of this materials family has still been limited. In this talk, I will introduce this new family of superconductors synthesized by a soft-chemistry approach and highlight the critical aspects of their electronic and magnetic structure. I will also present our latest work on novel synthetic approaches to the materials system and probing of their distinct features, in a broader context of the unusual role that rare-earth elements and chemical environment play [6]. Finally, I will suggest how new applications of kinetic-based synthetic approaches in oxide heterostructures provide a broad opportunity to create novel nickelate systems in previously inaccessible ways [7].

[1] D. Li et al., Nature 572, 624 (2019).
[2] D. Li et al., Physical Review Letters 125, 27001 (2020).

[3] K. Lee et al., Nature 619, 288 (2023).

[4] H. Lu et al., Science 373, 213 (2021).

[5] B. Y. Wang et al., Nature Physics 17, 473 (2021).

[6] Z. Dong et al., under review (2024).

[7] A. Raji et al., ACS Nano 18, 4077 (2024).

Biography of the Speaker: 

李丹枫，香港城市大学物理系助理教授，理学院副院长（科研与研究生教育），博士生导师。李教授本科毕业于浙江大学材料科学与工程专业，随后获得香港理工大学应用物理系研究型硕士学位（师从戴吉岩教授），2016年获得瑞士日内瓦大学量子物理系博士学位（师从Jean-Marc Triscone教授）。 2017年2月受瑞士国家自然科学基金资助，加入美国斯坦福大学从事博士后研究（合作导师HaroldHwang教授）。 2020年11月加入城大物理系。主要从事新型氧化物电子薄膜制备、原子尺度异质结外延生长、低维超导体系及界面新奇物理性质等相关研究。近年来在Nature、Science、Nature Materials、Nature Physics、PhysicalReview Letters、Nature Communications等学术期刊发表多篇重要论文。 2019年，他与Hwang教授领导的研究小组在世界上首次发现镍氧化物超导材料，解决了困扰超导学界超过三十年的难题，引起很大反响。因为此项发现，李教授获得2023年度亚太物理联合会-亚太理论物理中心杨振宁奖，入选2021年度麻省理工科技评论35岁以下创新者35人（中国）榜单。