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Dirac Nodal Line in Hourglass Semimetal Nb3SiTe6
Nano Letters ( IF 10.8 ) Pub Date : 2022-11-16 , DOI: 10.1021/acs.nanolett.2c03293 Ro-Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih-Chuan Su, Shih-Chang Weng, Meng-Kai Lin, Peng Chen, Cheng-Maw Cheng, Jonathan D. Denlinger, Sung-Kwan Mo, Alexei V. Fedorov, Chia-Seng Chang, Horng-Tay Jeng, Tien-Ming Chuang, Tai-Chang Chiang
Nano Letters ( IF 10.8 ) Pub Date : 2022-11-16 , DOI: 10.1021/acs.nanolett.2c03293 Ro-Ya Liu, Angus Huang, Raman Sankar, Joseph Andrew Hlevyack, Chih-Chuan Su, Shih-Chang Weng, Meng-Kai Lin, Peng Chen, Cheng-Maw Cheng, Jonathan D. Denlinger, Sung-Kwan Mo, Alexei V. Fedorov, Chia-Seng Chang, Horng-Tay Jeng, Tien-Ming Chuang, Tai-Chang Chiang
Glide-mirror symmetry in nonsymmorphic crystals can foster the emergence of novel hourglass nodal loop states. Here, we present spectroscopic signatures from angle-resolved photoemission of a predicted topological hourglass semimetal phase in Nb3SiTe6. Linear band crossings are observed at the zone boundary of Nb3SiTe6, which could be the origin of the nontrivial Berry phase and are consistent with a predicted glide quantum spin Hall effect; such linear band crossings connect to form a nodal loop. Furthermore, the saddle-like Fermi surface of Nb3SiTe6 observed in our results helps unveil linear band crossings that could be missed. In situ alkali-metal doping of Nb3SiTe6 also facilitated the observation of other band crossings and parabolic bands at the zone center correlated with accidental nodal loop states. Overall, our results complete the system’s band structure, help explain prior Hall measurements, and suggest the existence of a nodal loop at the zone center of Nb3SiTe6.
中文翻译:
沙漏半金属 Nb3SiTe6 中的狄拉克节点线
非对称晶体中的滑动镜对称性可以促进新型沙漏节点循环状态的出现。在这里,我们展示了 Nb 3 SiTe 6中预测的拓扑沙漏半金属相的角度分辨光电子发射的光谱特征。在 Nb 3 SiTe 6的带边界处观察到线性带交叉,这可能是非平凡的 Berry 相的起源,并且与预测的滑行量子自旋霍尔效应一致;这种线性带交叉连接形成节点环。此外,在我们的结果中观察到的 Nb 3 SiTe 6的马鞍状费米表面有助于揭示可能被遗漏的线性带交叉。就地Nb 3 SiTe 6的碱金属掺杂也有助于观察与意外节环状态相关的区域中心的其他带交叉和抛物线带。总的来说,我们的结果完善了系统的能带结构,有助于解释先前的霍尔测量,并表明在 Nb 3 SiTe 6的区域中心存在节点环。
更新日期:2022-11-16
中文翻译:
沙漏半金属 Nb3SiTe6 中的狄拉克节点线
非对称晶体中的滑动镜对称性可以促进新型沙漏节点循环状态的出现。在这里,我们展示了 Nb 3 SiTe 6中预测的拓扑沙漏半金属相的角度分辨光电子发射的光谱特征。在 Nb 3 SiTe 6的带边界处观察到线性带交叉,这可能是非平凡的 Berry 相的起源,并且与预测的滑行量子自旋霍尔效应一致;这种线性带交叉连接形成节点环。此外,在我们的结果中观察到的 Nb 3 SiTe 6的马鞍状费米表面有助于揭示可能被遗漏的线性带交叉。就地Nb 3 SiTe 6的碱金属掺杂也有助于观察与意外节环状态相关的区域中心的其他带交叉和抛物线带。总的来说,我们的结果完善了系统的能带结构,有助于解释先前的霍尔测量,并表明在 Nb 3 SiTe 6的区域中心存在节点环。