论文标题
电气Seebeck-contrast观察磁化大厅效应中的拓扑效应lu $ _2 $ v $ _2 $ o $ $ _7 $/重金属异质结构
Electrical Seebeck-Contrast Observation of Magnon Hall Effect in Topological Ferromagnet Lu$_2$V$_2$O$_7$/Heavy Metal Heterostructures
论文作者
论文摘要
镁厅效应（MHE）的观察仅依赖于对热厅电导率的挑战性测量。在这里，我们报告了一种高度敏感的电气Seebeck-contrast方法，用于观察MHE在Lu $ _2 $ _2 $ v $ _2 $ _2 $ _7 $/重金属异质结构，这对于探索新MHE材料及其应用是非常值得的。使用具有非常不同的塞贝克系数的测量线，我们建立了一种通用方法，该方法可以将贡献（例如MHE）分开，该方法会产生侧向温度下降的贡献，即与[例如，异常的Nernst效果（ANE）和自旋Seebeck效应（SSE）]分开，从而产生侧向电场。我们表明，合适的重金属叠加仪可以从半导体lu $ _2 $ v $ _2 $ o $ $ _7 $中消除固有的ANE和SSE信号。 lu $ _2 $ v $ _2 $ o $ _7 $中的MHE是具有不同方向的晶体中的Quasi Esotropic。除了在平面温度梯度下先前报道的横向MHE外，我们还发现了平面外温度梯度下的纵向MHE。
The observation of the magnon Hall effect (MHE) has relied solely on the challenging measurement of the thermal Hall conductivity. Here, we report a highly sensitive electrical Seebeck-contrast method for the observation of MHE in Lu$_2$V$_2$O$_7$/heavy metal heterostructures, that is highly desirable for the exploration of new MHE materials and their applications. Using measuring wires with very different Seebeck coefficients, we established a general method that can separate contributions (e.g., MHE) that generates a lateral temperature drop, from those [e.g., anomalous Nernst effect (ANE) and spin Seebeck effect (SSE)] that generate a lateral electric field. We show that a suitable heavy metal overlayer can eliminate the inherent ANE and SSE signals from the semiconducting Lu$_2$V$_2$O$_7$. The MHE in Lu$_2$V$_2$O$_7$ is quasi-isotropic among crystals with different orientations. In addition to the previously reported transverse MHE under an in-plane temperature gradient, we have uncovered longitudinal MHE under an out-of-plane temperature gradient.
