主讲人：蒋密 教授（苏州大学）

题目：Role of Ni-Nd Hybridization in Infinite-Layer Nickelates

时间：2023年05月18日（周四）上午10:00

地点：理工楼1226报告厅

联系人：钟寅

报告摘要：

The newly discovered superconductivity in hole doped infinite-layer nickelates (IL-N) have attracted extensive investigation. Motivated by the recent X-ray absorption spectroscopy (XAS) and resonant inelastic x-ray scattering (RIXS) experiments, based on Ni impurity calculations, we explored the nature of the parent compound and hole doped states of IL-N by including the crystal field splitting, the Ni-3d8 multiplet structure, and the hybridization between Ni-3d orbitals and the Nd-5d orbitals that are formally replaced with a totally symmetric orbital Zs based band centered at the missing O in the Nd layer. For the parent compound, we showed that the spectrum of Ni-3d9Zs2 state spreads over a large energy range and cannot be represented by a single orbital energy, which is qualitatively consistent with the RIXS measurements showing a broad distribution of the Ni-3d9z2 hole state. For the hole-doped systems, we showed that adding these additional ingredients can still result in the lowest-energy hole-doped state having a singlet character.

个人简介：

蒋密，教授，2014年于美国加州大学戴维斯分校获得博士学位，2014-2020年先后在瑞士ETH和加拿大UBC从事博士后研究工作，2021年加入苏州大学物理学院。研究兴趣集中在对各类强关联电子体系，如非常规超导体，重费米子材料等的理论和计算研究。近期研究方向侧重于新近发现的镍基超导体系和重费米子体系。