Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
Two-dimensionality of metallic surface conduction in Co3Sn2S2 thin films
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DOI：
10.1038/s42005-021-00627-y
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发表时间：
2021-06
影响因子：
5.5
通讯作者：
J. Ikeda;K. Fujiwara;J. Shiogai;T. Seki;K. Nomura;K. Takanashi;A. Tsukazaki
中科院分区：
文献类型：
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作者：
J. Ikeda;K. Fujiwara;J. Shiogai;T. Seki;K. Nomura;K. Takanashi;A. Tsukazaki
拓扑材料的二维（2D）表面是反映线性色散电子能带的导电通道。厚度相关的片电导测量是一种可靠的方法来评估的二维和三维（3D）的导电通道分开，但很少被应用于外尔半金属。通过应用这种方法的外尔半金属Co3Sn2S2薄膜，在这里，我们表明，2D导电通道清楚地出现在铁磁相下，表示形成的费米弧从外尔节点投影。三维电导率和二维电导率之间的比较提供了表面导电区域的有效厚度估计为约20 nm，这将反映Co3Sn2S2的电子带的Weyl特征。出现的表面传导将提供一个途径，激活量子和自旋电子输运功能源于一个外尔节点在薄膜为基础的设备。
Two-dimensional (2D) surface of the topological materials is an attractive channel for the electrical conduction reflecting the linearly-dispersive electronic bands. Thickness-dependent sheet conductance measurement is a reliable method to evaluate the 2D and three-dimensional (3D) electrical conducting channel separately but has rarely been applied for Weyl semimetals. By applying this method to thin films of a Weyl semimetal Co3Sn2S2, here we show that the 2D conducting channel clearly emerges under the ferromagnetic phase, indicating a formation of the Fermi arcs projected from Weyl nodes. Comparison between 3D conductivity and 2D conductance provides the effective thickness of the surface conducting region being estimated to be approximately 20 nm, which would reflect the Weyl feature of electronic bands of the Co3Sn2S2. The emergent surface conduction will provide a pathway to activate quantum and spintronic transport features stemming from a Weyl node in thin-film-based devices.