Observation of the Magnon Hall Effect
Observation of the Magnon Hall Effect
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DOI：
10.1126/science.1188260
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发表时间：
2010-07-16
期刊：
影响因子：
56.9
通讯作者：
Tokura, Y.
中科院分区：
文献类型：
--
作者：
Onose, Y.;Ideue, T.;Tokura, Y.
当洛伦兹力在垂直磁场存在下作用于充电电流时，霍尔效应通常发生在导体中。然而，诸如声子和自旋之类的中性准粒子可以携带热流，并且有可能在不借助洛伦兹力的情况下表现出热霍尔效应。我们报告了具有烧绿石晶格结构的绝缘铁磁体中自旋激发（磁振子）引起的异常热霍尔效应的实验证据。我们的理论分析表明，自旋波的传播受到 Dzyaloshinskii-Moriya 自旋轨道相互作用的影响，该相互作用起着矢量势的作用，就像金属铁磁体中固有的反常霍尔效应一样。
The Hall effect usually occurs in conductors when the Lorentz force acts on a charge current in the presence of a perpendicular magnetic field. Neutral quasi-particles such as phonons and spins can, however, carry heat current and potentially exhibit the thermal Hall effect without resorting to the Lorentz force. We report experimental evidence for the anomalous thermal Hall effect caused by spin excitations (magnons) in an insulating ferromagnet with a pyrochlore lattice structure. Our theoretical analysis indicates that the propagation of the spin waves is influenced by the Dzyaloshinskii-Moriya spin-orbit interaction, which plays the role of the vector potential, much as in the intrinsic anomalous Hall effect in metallic ferromagnets.