Abstract:
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.