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Uncover the nature of "hidden order" phase transition in the strong spin-orbit-coupled correlated metal Cd2Re2O7

來源:合肥微尺度物質科學國家研究中心
報告題目   Uncover the nature of "hidden order" phase transition in the strong spin-orbit-coupled correlated metal Cd2Re2O7
報告人   王義林 博士
報告人單位   布魯克海文國家實驗室凝聚態物理系
報告時間   2019-12-26 09:30:00
報告地點   合肥微尺度物質科學國家研究中心一樓科技展廳
主辦單位   合肥微尺度物質科學國家研究中心
報告介紹

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.

 

報告人簡介:

  王義林,2010年7月本科畢業于中國人民大學物理系;2016年7月于中國科學院物理研究所獲得理學博士學位;2016年9月至今,在布魯克海文國家實驗室凝聚態物理系擔任博士后研究員。研究領域主要包含:使用第一性原理計算方法 DFT+DMFT 和 DFT+Gutzwiller 進行強關聯材料的電子結構和磁性計算,重點關注多軌道體系;使用數值重整化群方法研究多軌道的Anderson 和Kondo雜質模型;基于精確對角化方法 (ED),理論模擬X-射線吸收譜(XAS)和共振非彈性散射譜(RIXS)。以第一作者身份已在 Physical Review Letters, Physical Review B, Computer Physics Communications等國際著名雜志上發表多篇研究論文。


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