PbBi $_{2}$ Te $_{4}$作为3D拓扑绝缘体的实验验证
Experimental verification of PbBi$_{2}$Te$_{4}$ as a 3D topological insulator
摘要：
首次提出了PbBi $_{2}$ Te $_{4}$中拓扑绝缘体态的实验证据。利用同步辐射角分辨光电子能谱（ARPES）观测到了单面狄拉克锥。拓扑不变量$\mathbb{Z}_2$由{ \it ab initio}能带结构计算为1;（111）。在已知的三维拓扑绝缘体中，观察到的体能隙中的二维等能线是最大的。这为在未来的自旋电子器件中实现足够大的自旋电流密度开辟了途径。
英文摘要：
The first experimental evidence is presented of the topological insulator state in PbBi$_{2}$Te$_{4}$. A single surface Dirac cone is observed by angle-resolved photoemission spectroscopy (ARPES) with synchrotron radiation. Topological invariants $\mathbb{Z}_2$ are calculated from the {\it ab initio} band structure to be 1; (111). The observed two-dimensional iso-energy contours in the bulk energy gap are found to be the largest among the known three-dimensional topological insulators. This opens a pathway to achieving a sufficiently large spin current density in future spintronic devices.
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