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首页> 外文期刊>Physical review >Berry curvature unravelled by the anomalous Nernst effect in Mn_3Ge
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Berry curvature unravelled by the anomalous Nernst effect in Mn_3Ge

机译：Mn_3Ge中的异常能斯特效应解开了浆果曲率

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摘要

The discovery of topological quantum materials represents a striking innovation in modern condensed matter physics with remarkable fundamental and technological implications. Their classification has been recently extended to topological Weyl semimetals, i.e., solid-state systems which exhibit the elusive Weyl fermions as low-energy excitations. Here we show that the Nernst effect can be exploited as a sensitive probe for determining key parameters of the Weyl physics, applying it to the noncollinear antiferromagnet Mn3Ge. This compound exhibits anomalous thermoelectric transport due to enhanced Berry curvature from Weyl points located extremely close to the Fermi level. We establish from our data a direct measure of the Berry curvature at the Fermi level and, using a minimal model of a Weyl semimetal, extract the Weyl point energy and their distance in momentum space.
机译：拓扑量子材料的发现代表了现代凝聚态物理的一项惊人创新，具有重大的基础和技术意义。它们的分类最近已扩展到拓扑Weyl半金属，即表现出难以捉摸的Weyl费米作为低能激发的固态系统。在这里，我们显示能斯特效应可以用作确定韦尔物理学关键参数的灵敏探针，并将其应用于非共线反铁磁体Mn3Ge。由于来自非常接近费米能级的Weyl点的Berry曲率增加，该化合物表现出异常的热电传输。我们根据数据建立费米能级的贝里曲率的直接量度，并使用Weyl半金属的最小模型提取Weyl点能量及其在动量空间中的距离。

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