Kagome磁体Fe$_3$Sn$_2$中的轨道磁非线性反常霍尔效应
Orbital Magneto-Nonlinear Anomalous Hall Effect in Kagome Magnet Fe$_3$Sn$_2$
AI总结：
本研究结合实验与第一性原理计算，在kagome铁磁体Fe$_3$Sn$_2$中发现轨道起源的磁非线性反常霍尔效应，证实其由布洛赫电子内禀量子几何特性调控，为霍尔输运研究开辟新方向。
摘要：
理论预测表明，电磁场对贝里曲率的微扰会产生与散射无关的内禀非线性反常霍尔效应，这类效应预期存在两种类型。电非线性霍尔效应近来已开始受到关注，而针对磁非线性霍尔效应的研究却极少。本文结合实验与第一性原理计算，证明kagome铁磁体Fe$_3$Sn$_2$存在这种磁非线性霍尔效应。通过系统的场角度依赖与温度依赖输运测量，我们利用独特的面内构型，明确识别出一种与施加的面内电场和面内磁场均呈线性关系的大反常霍尔电流。我们阐明了其主导的轨道起源，并将其与磁非线性霍尔效应相关联。该效应由布洛赫电子的内禀量子几何特性调控。我们的结果凸显了来自轨道自由度的电子波函数量子几何的重要性，为霍尔输运效应开辟了新方向。
英文摘要：
It has been theoretically predicted that perturbation of the Berry curvature by electromagnetic fields gives rise to intrinsic nonlinear anomalous Hall effects that are independent of scattering. Two types of nonlinear anomalous Hall effects are expected. The electric nonlinear Hall effect has recently begun to receive attention, while very few studies are concerned with the magneto-nonlinear Hall effect. Here, we combine experiment and first-principles calculations to show that the kagome ferromagnet Fe$_3$Sn$_2$ displays such a magneto-nonlinear Hall effect. By systematic field angular and temperature-dependent transport measurements, we unambiguously identify a large anomalous Hall current that is linear in both applied in-plane electric and magnetic fields, utilizing a unique in-plane configuration. We clarify its dominant orbital origin and connect it to the magneto-nonlinear Hall effect. The effect is governed by the intrinsic quantum geometric properties of Bloch electrons. Our results demonstrate the significance of the quantum geometry of electron wave functions from the orbital degree of freedom and open up a new direction in Hall transport effects.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
