论文标题
在强大的非线性政权中违反镁质Wiedemann-Franz法律
Violation of the magnonic Wiedemann-Franz law in the strong nonlinear regime
论文作者
论文摘要
著名的Wiedemann-Franz（WF）法律，该法律控制了Wiedemann和Franz于1853年与实验发现之间的关系之间的关系。尽管Fermions和Boson之间的量子统计特性有根本的差异，但由于发现WF法律用于Magnon Transport的WF法律，最近发现，WF法律在低温下的线性行为是普遍的特性。但是，WF法律是针对线性响应的，即使在Bose Systems的非线性制度中，普遍法律是否有效仍然是一个空旷的问题。在这里，我们为这一基本挑战提供了解决方案。我们表明，在拓扑上琐碎的绝缘磁体中，热元素的热传输系数与线性响应的行为不同，而通用定律则在强非线性方案中分解。这一发现在当前的设备和测量技术的实验范围内。我们的发现是基于磁蛋白的Spintronics的关键成分，在评估Spintronics设备的热磁转换元件的功绩方面。
The celebrated Wiedemann-Franz (WF) law which governs the relation between charge and heat transport traces back to the experimental discovery in 1853 by Wiedemann and Franz. Despite the fundamental difference of the quantum-statistical properties between fermions and bosons, the linear-in-$T$ behavior of the WF law at low temperatures has recently been found to be the universal property by the discovery of the WF law for magnon transport. However, the WF law is for the linear response, and whether or not the universal law is valid even in the nonlinear regime of Bose systems remains an open issue. Here we provide a solution to this fundamental challenge. We show that the ratio of the thermal to spin transport coefficient of magnons in topologically trivial insulating magnets exhibits a different behavior from the linear response and the universal law breaks down in the strong nonlinear regime. This finding is within experimental reach with current device and measurement technologies. Our discovery is the key ingredient in magnon-based spintronics, in the evaluation of the figure of merit for thermomagnetic conversion elements of spintronics devices.
