Electronic structure study of rare-earth monopnictide DySb*

Extreme magnetoresistance (XMR), magnetic and structural phase transition, and possible non-trivial topological phases in the rare-earth monopnictide family have recently invigorated intense research interest. Recent publications have experimentally revealed the presence of a Dirac-like semimetallic phases in some of the lighter rare earth monopnictide materials. This study investigates the electronic structure of other members with higher f-electrons in this family. In particular, here we present a combined study using angle-resolved photoemission spectroscopy (ARPES) and first-principles calculations on DySb. A bulk band gap that lacks band inversion is observed at the (X) point of the BZ, which is further supported by our first-principles calculations. Our study establishes DySb as a trivial semimetal and provides a direction to develop a deeper understanding of XMR through rare-earth correlated materials.