Mayo Alex Hiro, Deaconu Darius-Alexandru, Masuda Hidetoshi, Nii Yoichi, Takahashi Hidefumi, Belosludov Rodion Vladimirovich, Ishiwata Shintaro, Bahramy Mohammad Saeed, Onose Yoshinori
Institute for Materials Research, Tohoku University, Sendai 980-8577, Japan.
Department of Physics and Astronomy, School of Natural Sciences, The University of Manchester, Manchester M13 9PL, United Kingdom.
Proc Natl Acad Sci U S A. 2025 Jan 28;122(4):e2405839122. doi: 10.1073/pnas.2405839122. Epub 2025 Jan 23.
Chiral magnetic textures give rise to unconventional magnetotransport phenomena such as the topological Hall effect and nonreciprocal electronic transport. While the correspondence between topology or symmetry of chiral magnetic structures and such transport phenomena has been well established, a microscopic understanding based on the spin-dependent band structure in momentum space remains elusive. Here, we demonstrate how a chiral magnetic superstructure introduces an asymmetry in the electronic band structure and triggers a nonreciprocal electronic transport in a centrosymmetric helimagnet α-EuP. The magnetic structure of α-EuP is highly tunable by a magnetic field and closely coupled to its semimetallic electronic band structure, enabling a systematic study across chiral and achiral magnetic phases on the correspondence between nonreciprocal transport and electronic band asymmetry. Our findings reveal how a microscopic change in the magnetic configuration of charge carriers can lead to nonreciprocal electronic transport, paving the way for designing chiral magnets with desirable properties.
手性磁织构会引发诸如拓扑霍尔效应和非互易电子输运等非常规磁输运现象。虽然手性磁结构的拓扑或对称性与此类输运现象之间的对应关系已得到充分确立，但基于动量空间中自旋相关能带结构的微观理解仍难以捉摸。在此，我们展示了手性磁超结构如何在电子能带结构中引入不对称性，并在中心对称的螺旋磁体α-EuP中引发非互易电子输运。α-EuP的磁结构可通过磁场高度调谐，并与其半金属电子能带结构紧密耦合，从而能够对手性和非手性磁相之间非互易输运与电子能带不对称性之间的对应关系进行系统研究。我们的研究结果揭示了电荷载流子磁构型的微观变化如何导致非互易电子输运，为设计具有理想特性的手性磁体铺平了道路。
