Electronic Structure of Topological Material CaMnSb₂

AMnPn₂ (A = Ca, Sr, Ba, Eu, Yb; Pn = Sb, Bi) compounds are new kind of topological materials. Theoretical studies indicate that AMnPn₂ host an anisotropic Dirac cone near the Fermi surface. Here we report our high-resolution laser-based angle-resolved photoemission measurements on the electronic structure of CaMnSb₂. The Fermi surface of CaMnSb₂ mainly consists of one hole pocket around the Brillouin zone center and two tiny hole pockets at the Brillouin zone boundary which are consistent with the first principle calculations. In addition, we observe four additional points located at the hole pocket around the Brillouin zone center along the high symmetry directions which is hard to be accounted for by band structure calculations.