原子有序AuTe2Se4/3立方体二聚化的二维超导性
Two-dimensional Superconductivity from Dimerization of Atomically Ordered AuTe2Se4/3 Cubes
摘要：
在严格的二维晶体物质中可以观察到超导电性和拓扑相变等涌现现象。人工界面和单原子厚度层是这类典型的2D材料。尽管具有2D特征，但是大多数大体积层状化合物不具有这些惊人的特性。在这里，我们报告的2D超导体在庞大的AuTe 2Se 4/3，其中的维数减少是通过诱导延长的共价Te-Te键。原子分辨率图像显示Au、Te和Se原子有序排列在一个立方体中，其中Te-Te键为3.18A和3.28A。发现了2.85K的超导电性，并解释了由于BKT拓扑跃迁而导致的准二维性质。近似平行的费米面的嵌套可以产生强的电子-声子耦合。建议进一步耗尽厚度可能会导致更多的拓扑相关现象。
英文摘要：
The emergent phenomena such as superconductivity and topological phase transitions can be observed in strict two-dimensional crystalline matters. Artificial interfaces and one atomic thickness layers are typical 2D materials of this kind. Although having 2D characters, most bulky layered compounds, however, do not possess these striking properties. Here, we report the 2D superconductivity in bulky AuTe2Se4/3,where the reduction in dimensionality is achieved through inducing the elongated covalent Te-Te bonds. The atomic-resolution images reveal that the Au, Te and Se are atomically ordered in a cube, among which are Te-Te bonds of 3.18 A and 3.28 A. The superconductivity at 2.85 K is discovered, which is unraveled to be the quasi-2D nature owing to the BKT topological transition. The nesting of nearly parallel Fermi sheets could give rise to strong electron-phonon coupling. It is proposed to further depleting the thickness could result in more topologically-related phenomena.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
