钾嵌入二硒化钽中的等离子体激元演化和电荷密度波抑制
Plasmon Evolution and Charge-Density Wave Suppression in Potassium Intercalated Tantalum Diselenide
摘要：
利用电子能量损失谱和密度泛函理论研究了钾的嵌入对2 H-二硒化钽电荷密度波（CDW）不稳定性形成的影响。我们的观察结果是一致的填充的导带所示的等离子体频率在实验和理论上的大幅下降。此外，弹性散射清楚地指出，嵌入时的CDW的破坏，可以看到相应的上层结构的消失。这是伴随着一个新的超结构，这可以归因于插入钾。基于插层时c轴的行为，我们认为碱金属的层间位点是有利的，并且晶格仍处于2 H修饰状态。
英文摘要：
We have investigated the influence of potassium intercalation on the formation of the charge-density wave (CDW) instability in 2H-tantalum diselenide by means of Electron Energy-Loss Spectroscopy and density functional theory. Our observations are consistent with a filling of the conduction band as indicated by a substantial decrease of the plasma frequency in experiment and theory. In addition, elastic scattering clearly points to a destruction of the CDW upon intercalation as can be seen by a vanishing of the corresponding superstructures. This is accompanied by a new superstructure, which can be attributed to the intercalated potassium. Based on the behavior of the c-axis upon intercalation we argue in favor of interlayer-sites for the alkali-metal and that the lattice remains in the 2H-modification.
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