Presentation Information

[25p-71B-2]Dirac nodal line in hourglass semimetal Nb3SiTe6

〇RoYa Liu1, Angus Huang2, Raman Sankar3, Joseph Andrew Hlevyack4, Chih-Chuan Su3, Shih-Chang Weng1, Meng-Kai Lin4, Peng Chen5, Cheng-Maw Cheng1, Jonathan Denlinger6, Sung-Kwan Mo6, Alexei Fedorov6, Chia-Seng Chang3, Horng-Tay Jeng2, Tien-Ming Chuang3, Tai-Chang Chiang4 (1.NSRRC, Taiwan, 2.DOP, NTHU, Taiwan, 3.IOP, Academia Sinica, 4.DOP, UIUC, US, 5.SOPA, SJTU, China, 6.ALS, LBNL, US)


hourglass fermions,angle-resolved photoemission spectroscopy,nonsymmorphic crystals

In 2010s, it was predicted that two different kinds of materials would contain the hourglass fermion, a new kind of electronic state. The electronic state exhibits the three-dimensional quantum spin hall effect as well as a unique hourglass fermion band dispersion. In this study, we examined the electronic structure of layered semi-metallic material Nb3SiTe6 using angle-resolved photoemission spectroscopy, scanning tunneling microscopy, xray diffraction, and other technologies. We found the electronic spin flow in this system in addition to the intriguing hourglass fermion's Dirac nodal lines. 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.