论文标题
强大的零零线与GE空位和非词型HFGE0.92TE中可能的自旋轨道点
Robust Dirac lines against Ge vacancy and possible spin-orbit Dirac points in nonsymmorphic HfGe0.92Te
论文作者
论文摘要
寻找带有狄拉克点的新材料一直是一个令人着迷的研究主题。在这里，我们报告了HFGE0.92TE单晶的生长，晶体结构和带结构，其中包含三种不同类型的狄拉克点。 HFGE0.92TE在非形态四方空间群P4/NMM（第129号）中结晶，具有空位约为8％的方形Ge-Atom平面。尽管在GE站点上有空缺，但使用角度分辨的光发射光谱法观察到由常规的Dirac点（SOC）组成的DIRAC节点线，并伴随着由非甲状腺型对称性对SOC和空缺的非甲型对称性保护的强大狄拉克线。特别是，根据我们的实验和计算，暗示存在于SOC下形成的表面的自旋轨道点（SDP）。观察到Quasi-Two维（准2D）字符，并通过角度分辨的磁倍率进一步确认。 HFGE0.92TE是探索具有三种不同类型的狄拉克点的外来拓扑阶段或拓扑特性的好候选者，也是实现2D SDP的有前途的候选人。
Looking for new materials with Dirac points has been a fascinating subject of research. Here we report the growth, crystal structure, and band structure of HfGe0.92Te single crystals, featuring three different types of Dirac points. HfGe0.92Te crystalizes in a nonsymmorphic tetragonal space group P4/nmm (No. 129), having square Ge-atom plane with vacancies about 8%. Despite the vacancies on Ge site, the Dirac nodal line composed of conventional Dirac points vulnerable to spin-orbit coupling (SOC) is observed using angle-resolved photoemission spectroscopy, accompanied with the robust Dirac line protected by the nonsymmorphic symmetry against both SOC and vacancies. Specially, spin-orbit Dirac points (SDPs) originated from the surface formed under SOC are hinted to exist according to our experiments and calculations. Quasi-two-dimensional (quasi-2D) characters are observed and further confirmed by angular-resolved magnetoresistance. HfGe0.92Te is a good candidate to explore exotic topological phases or topological properties with three different types of Dirac points and a promising candidate to realize 2D SDPs.
