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Pressure-induced a partial disorder and superconductivity in quasi-one-dimensional Weyl semimetal (NbSe4)2I
Materials Today Physics ( IF 11.5 ) Pub Date : 2021-08-21 , DOI: 10.1016/j.mtphys.2021.100509
C. Pei 1 , W. Shi 2, 3 , Y. Zhao 1 , L. Gao 1 , J. Gao 4, 5 , Y. Li 1, 6 , H. Zhu 1 , Q. Zhang 1 , N. Yu 1 , C. Li 1 , W. Cao 1 , S.A. Medvedev 7 , C. Felser 7 , B. Yan 8 , Z. Liu 1 , Y. Chen 1, 6 , Z. Wang 4, 5 , Y. Qi 1
Affiliation  

A search for the single material system that simultaneously exhibits topological phase and intrinsic superconductivity has been largely limited, although such a system is far more favorable especially for the quantum device applications. Except artificially engineered topological superconductivity in heterostructure systems, another alternative is to have superconductivity arising from the topological materials by pressure or other “clean” technology. Here, based on first-principles calculations, we first show that quasi-one-dimensional compound (NbSe4)2I represents a rare example of a chiral Weyl semimetal in which the set of symmetry-related Weyl points (WPs) exhibit the same chiral charge at a certain energy. The net chiral charge (NCC) of the below Fermi level EF (or a certain energy) can be tuned by pressure. In addition, a partial disorder induced by pressure accompanied with superconductivity emerges. Although amorphization of the iodine sub-lattice under high pressure, the one-dimensional NbSe4 chains in (NbSe4)2I remain intact and provide a superconducting channel in one dimension. Our combined theoretical and experimental research provide critical insight into a new phase of the one-dimensional system, in which distinctive phase transitions and correlated topological states emerge upon compression.



中文翻译:

准一维外尔半金属 (NbSe4)2I 中压力引起的局部无序和超导性

对同时表现出拓扑相和本征超导性的单一材料系统的探索在很大程度上受到了限制,尽管这种系统尤其适用于量子器件应用。除了在异质结构系统中人工设计的拓扑超导性之外,另一种选择是通过压力或其他“清洁”技术使拓扑材料产生超导性。在这里,基于第一性原理计算,我们首先表明准一维化合物 (NbSe 4 ) 2 I 代表了手性 Weyl 半金属的一个罕见例子,其中一组与对称相关的 Weyl 点 (WPs) 表现出相同的一定能量下的手性电荷。费米能级E以下的净手性电荷 (NCC)F(或某种能量)可以通过压力进行调节。此外,出现了伴随超导性的压力引起的局部无序。尽管碘亚晶格在高压下非晶化,但(NbSe 4 ) 2 I 中的一维 NbSe 4链保持完整并提供一维超导通道。我们结合理论和实验研究为一维系统的一个新阶段提供了重要的见解,其中在压缩时会出现独特的相变和相关的拓扑状态。

更新日期:2021-09-03
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