Chen Guifeng, Long Bolin, Jin Lei, Zhang Hui, Cheng Zishuang, Zhang Xiaoming, Liu Guodong
Hebei Engineering Laboratory of Photoelectronic Functional Crystals, Hebei University of Technology, Tianjin 300130, China.
School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300130, China.
Nanomaterials (Basel). 2023 Apr 17;13(8):1389. doi: 10.3390/nano13081389.
We synthesize SnCoS in experiment and study its topological properties in theory. By first-principles calculations, we study the band structure and surface state of SnCoS with L2 structure. It is found that the material has type-II nodal line in the Brillouin zone and clear drumhead-like surface state when the spin-orbit coupling is not considered. In the case of spin-orbit coupling, the nodal line will open gap, leaving the Dirac points. To check the stability of the material in nature, we synthesize SnCoS nanowires with L2 structure in an anodic aluminum oxide (AAO) template directly by the electrochemical deposition (ECD) method with direct current (DC). Additionally, the diameter of the typical SnCoS nanowires is about 70 nm, with a length of about 70 μm. The SnCoS nanowires are single crystals with an axis direction of [100], and the lattice constant determined by XRD and TEM is 6.0 Å. Overall, our work provides realistic material to study the nodal line and Dirac fermions.
我们在实验中合成了SnCoS，并在理论上研究了其拓扑性质。通过第一性原理计算，我们研究了具有L2结构的SnCoS的能带结构和表面态。研究发现，当不考虑自旋轨道耦合时，该材料在布里渊区具有II型节线和清晰的鼓面状表面态。在考虑自旋轨道耦合的情况下，节线会打开能隙，留下狄拉克点。为了检验该材料在自然界中的稳定性，我们通过直流电化学沉积（ECD）方法在阳极氧化铝（AAO）模板中直接合成了具有L2结构的SnCoS纳米线。此外，典型的SnCoS纳米线直径约为70 nm，长度约为70 μm。SnCoS纳米线是单晶，其轴向为[100]，通过XRD和TEM确定的晶格常数为6.0 Å。总的来说，我们的工作为研究节线和狄拉克费米子提供了实际材料。
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