Experimental study of topological phases in strongly correlated system

强相关系统拓扑相的实验研究

• 批准号: 20F20315
• 负责人: 中辻 知
• 金额: $ 1.47万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for JSPS Fellows
• 财政年份: 2020
• 资助国家: 日本
• 起止时间: 2020-11-13 至 2023-03-31
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-20F20315/
• 关键词: Nodal Line; Anomalous Nernst Effect; Nodal line; Kagome Lattice; Magnetic Weyl Semimetal

We systematically studied the composition dependence of anomalous Nernst effect (ANE) in FexGa4-x system. Our research provides an ideal candidate for application using ANE. Firstly, We find a peak value of 5.4 μV/K in Fe3.09Ga0.91 which is the largest room-temperature value so far observed in polycrystalline magnetic compounds. Moreover, we found this large room-temperature ANE in the polycrystalline Fe3Ga is robust against Fe doping, making this material a promising candidate. Secondly, our work provides an experimental realization of the tuning of the anomalous Nernst effect by the Berry curvature engineering. Our theoretical analysis suggests that the Fe doping increases the exchange splitting effect, thereby tuning Berry curvature near the Fermi energy.

本文系统地研究了FexGa_（4-x）体系反常能斯特效应（ANE）的组分依赖性。我们的研究提供了一个理想的候选人的应用程序使用ANE。首先，我们在Fe_（3.09）Ga_（0.91）中发现了一个峰值，为5.4 μV/K，这是迄今为止在多晶磁性化合物中所观察到的最大的室温值。此外，我们发现多晶Fe 3 Ga中的这种大的室温ANE对Fe掺杂具有鲁棒性，使这种材料成为一种有希望的候选材料。其次，我们的工作提供了一个实验实现的反常能斯特效应的贝里曲率工程调谐。我们的理论分析表明，Fe掺杂增加了交换分裂效应，从而调谐附近的费米能的Berry曲率。

项目成果

Anomalous Nernst Effect in Dope Fe3Ga

Fe3Ga掺杂中的反常能斯特效应

• 发表时间: 2020
• 作者: Shuttleworth;Kyle Michael James;Mostafa Khalili;Zili Feng
• 通讯作者: Zili Feng

Giant and Robust Anomalous Nernst Effect in a Polycrystalline Topological Ferromagnet at Room Temperature

室温下多晶拓扑铁磁体中巨大而鲁棒的反常能斯特效应

• DOI: 10.1002/adfm.202206519
• 发表时间: 2022
• 期刊: Advanced Functional Materials
• 影响因子: 19
• 作者: Feng Zili;Minami Susumu;Akamatsu Shuhei;Sakai Akito;Chen Taishi;Nishio‐Hamane Daisuke;Nakatsuji Satoru
• 通讯作者: Nakatsuji Satoru

中辻研究室

中辻实验室