Study of topological states in NdBi using Scanning tunneling microscope

Some rare-earth monopnictides such as NdBi are considered to host novel topological states and are being extensively studied both experimentally and theoretically. The bulk electronic structure of NdBi is reminiscent of other monopnictides and consists of hole pockets at the Γ point and an ellipsoidal electron pocket in each M point of the Brillouin zone. When entering the Anti-Ferromagnetic phase, topological surface states and Fermi-arcs emerge. We use scanning tunneling microscopy/spectroscopy to study NdBi at low temperatures deep inside the Anti-Ferromagnetic phase. We find evidence of the surface states, and edge states and their interplay with different layers in the material through QPI and scanning tunneling spectroscopy.