论文标题
在1T'-TATE $ _ {2} $中直接可视化修剪状态
Direct Visualization of Trimerized States in 1T'-TaTe$_{2}$
论文作者
论文摘要
包含牙合阴离子的过渡金属二分裂元素显示出显着的电荷晶格调制结构和突出的层间特征。使用低温扫描透射电子显微镜（STEM），我们绘制了1T'-TATE $ _ {2} $的高温（HT）和低温（LT）调制相的原子尺度结构。在HT，我们直接显示了平面内金属扭曲，形成了修剪的簇和交错的三层堆叠。在93 K处的LT阶段，我们通过从计划视图STEM数据中的对比度调制中提取结构信息来可视化TA位点的额外修剪和TE位点的细微扭曲。加上密度功能理论的计算和图像模拟，这种方法为低温相变和各种分层系统中的低温相变和复杂位移的原子尺度可视化开辟了大门。
Transition-metal dichalcogenides containing tellurium anions show remarkable charge-lattice modulated structures and prominent interlayer character. Using cryogenic scanning transmission electron microscopy (STEM), we map the atomic-scale structures of the high temperature (HT) and low temperature (LT) modulated phases in 1T'-TaTe$_{2}$. At HT, we directly show in-plane metal distortions which form trimerized clusters and staggered, three-layer stacking. In the LT phase at 93 K, we visualize an additional trimerization of Ta sites and subtle distortions of Te sites by extracting structural information from contrast modulations in plan-view STEM data. Coupled with density functional theory calculations and image simulations, this approach opens the door for atomic-scale visualizations of low temperature phase transitions and complex displacements in a variety of layered systems.
