Breaking Down the Magnonic Wiedemann-Franz Law in the Hydrodynamic Regime.
Breaking Down the Magnonic Wiedemann-Franz Law in the Hydrodynamic Regime.
复制标题
DOI：
10.1103/physrevlett.130.166201
复制
发表时间：
2022-08
影响因子：
8.6
通讯作者：
Ryota Sano;M. Matsuo
中科院分区：
文献类型：
--
作者：
Ryota Sano;M. Matsuo
最近的实验表明，在超纯铁磁绝缘体中存在流体动力学磁振子行为，但仍然缺乏对其的直接观察。在这里，我们推导出一组耦合的流体动力学方程，并研究了这种磁振子流体的热传导和自旋传导。我们揭示了磁振子Wiedemann-Franz定律的急剧崩溃作为流体动力学制度的标志，这将成为实验实现紧急流体动力学磁振子行为的关键证据。因此，我们的结果铺平了直接观察磁振子流体的道路。
Recent experiments have shown an indication of a hydrodynamic magnon behavior in ultrapure ferromagnetic insulators; however, its direct observation is still lacking. Here, we derive a set of coupled hydrodynamic equations and study the thermal and spin conductivities for such a magnon fluid. We reveal the drastic breakdown of the magnonic Wiedemann-Franz law as a hallmark of the hydrodynamics regime, which will become key evidence for the experimental realization of an emergent hydrodynamic magnon behavior. Therefore, our results pave the way toward the direct observation of magnon fluids.