Abstract：

　　Inversion symmetry breaking in materials with strong spin-orbital interaction will induce novel phenomena such as Rashba effect, Weyl fermions and odd-parity topological superconductors. When this happens at presence of strong electronic correlations, its effects have not been well studied yet. Here, we show that it can dramatically changes the electronic properties by studying the mysterious "hidden order" phase transition in the strong spin-orbit-coupled correlated metal, Cd₂Re₂O₇, where a tiny structure change with inversion symmetry breaking induces dramatic changes in its electronic properties. For this study, we apply the first-principle density functional theory plus dynamical mean-filed theory method and transport measurements. Our results show that the electronic correlations in Cd₂Re₂O₇ derive mainly from Hund's couplings, and the correlation strength is significantly reduced after losing the inversion symmetry which is caused by enhancing the dynamical mean-field function through the splitting of Kramers degenerate bands. Our results can naturally interpret the electronic anomalies across the phase transition without any electronic orders.

报告人简介：

　　王义林，2010年7月本科毕业于中国人民大学物理系；2016年7月于中国科学院物理研究所获得理学博士学位；2016年9月至今，在布鲁克海文国家实验室凝聚态物理系担任博士后研究员。研究领域主要包含：使用第一性原理计算方法 DFT+DMFT 和 DFT+Gutzwiller 进行强关联材料的电子结构和磁性计算，重点关注多轨道体系；使用数值重整化群方法研究多轨道的Anderson 和Kondo杂质模型；基于精确对角化方法 (ED)，理论模拟X-射线吸收谱(XAS)和共振非弹性散射谱(RIXS)。以第一作者身份已在 Physical Review Letters, Physical Review B, Computer Physics Communications等国际著名杂志上发表多篇研究论文。