Type: Article
Publication Date: 2020-06-22
Citations: 18
DOI: https://doi.org/10.1073/pnas.2002361117
Significance The correlation-driven topological insulator is a poorly understood state of matter where topological protection is afforded in the absence of well-defined quasiparticles. Ongoing research is hampered by the scarcity of model material families, consisting of only the 4f rare-earth boride compounds thus far. Here we establish a class of candidate topological Kondo insulator in FeSb 2 , based on 3d electrons instead of 4f electrons. Comparison between the different families will allow identification of key ingredients responsible for the exotic insulating state. Our band-structure measurements will serve as important guides for theoretical modeling of the correlated insulating state in this system.