Electronic Structure Examination on the Topological Properties of CaMnSb${}_2$ by Angle-Resolved Photoemission Spectroscopy

Abstract

We have carried out detailed high resolution ARPES measurements and band structure calculations to study the electronic structure of CaMnSb${}_2$. The observed Fermi surface mainly consists of one hole pocket around $\hat{I}“$ point and one tiny hole pocket at Y point. Strong spectral weight accumulation along the $\hat{I}“$-X direction is observed on the hole-like Fermi surface around $\hat{I}“$ point, suggesting strong anisotropy of the density of states along the Fermi surface. The tiny hole pocket at Y point originates from an anisotropic Dirac-like band with the crossing point of the linear bands lying $\sim$ 10 meV above the Fermi level. These observations are in a good agreement with the band structure calculations. In addition, we observe additional features along the $\hat{I}“$-Y line that cannot be accounted for by the band structure calculations. Our results provide important information in understanding and exploration of novel properties in CaMnSb${}_2$ and related materials.