Go Gyungchoon, An Daehyeon, Lee Hyun-Woo, Kim Se Kwon
Department of Physics, Korea Advanced Institute of Science and Technology, Daejeon 34141, Korea.
Department of Physics, Pohang University of Science and Technology, Pohang 37673, Korea.
Nano Lett. 2024 May 22;24(20):5968-5974. doi: 10.1021/acs.nanolett.4c00430. Epub 2024 Apr 29.
Recently, topological responses of magnons have emerged as a central theme in magnetism and spintronics. However, resulting Hall responses are typically weak and infrequent, since, according to present understanding, they arise from effective spin-orbit couplings, which are weaker compared to the exchange energy. Here, by investigating transport properties of magnon orbital moments, we predict that the magnon orbital Nernst effect is an intrinsic characteristic of the honeycomb antiferromagnet and therefore, it manifests even in the absence of spin-orbit coupling. For the electric detection, we propose an experimental scheme based on the magnetoelectric effect. Our results break the conventional wisdom that the Hall transport of magnons requires spin-orbit coupling by predicting the magnon orbital Nernst effect in a system without it, which leads us to envision that our work initiates the intensive search for various magnon Hall effects in generic magnetic systems with no reliance on spin-orbit coupling.
最近，磁振子的拓扑响应已成为磁学和自旋电子学的核心主题。然而，由于根据目前的理解，产生的霍尔响应通常较弱且不常见，因为它们源于有效的自旋轨道耦合，与交换能相比，这种耦合较弱。在这里，通过研究磁振子轨道矩的输运性质，我们预测磁振子轨道能斯特效应是蜂窝状反铁磁体的固有特性，因此，即使在没有自旋轨道耦合的情况下也会表现出来。对于电检测，我们提出了一种基于磁电效应的实验方案。我们的结果打破了传统观念，即磁振子的霍尔输运需要自旋轨道耦合，因为我们预测了在没有自旋轨道耦合的系统中磁振子轨道能斯特效应，这使我们设想我们的工作开启了在不依赖自旋轨道耦合的一般磁性系统中对各种磁振子霍尔效应的深入研究。
