Observation of Nodal Line in Non-Symmorphic Topological Semimetal InBi

Topological nodal semimetal (TNS) is a general term to categorize semimetal whose touching energy bands has a non-trivial topological property. The subset of TNS called topological nodal line semimetal (TNLS) is also predicted where the touching bands form a degenerate one-dimension line. These touching bands may also be further protected by its crystal symmetry. In this talk, we will present our work on the bulk and surface electronic structure of the non-symmorphic TNLS in InBi by using angle resolved photoemission spectroscopy (ARPES). By changing the incoming photon energy, we have tracked the crossing points of the bulk bands and discovered the nodal-line feature along the kz direction, in agreement with the ab-initio calculations. Our work provides a new material platform for the study of these exotic topological quantum phases and paves the way for possible future applications.