Electronic band structure of Charge Density Wave PdxHoTe3

The origin of superconductivity and interplay between superconductivity and different ground states remains challenging. The Pd-intercalated HoT$_3$, suppresses the charge density wave (CDW) order and leads to the superconductivity. Here we report the detailed Angle-resolved photoemission spectroscopy (ARPES) study of the electronic structure on Pd$_x$HoT$_3$. In the CDW parent phase (HoT$_3$), we found out the Fermi surface topology, CDW gap symmetry have 2 fold symmetry, with one CDW vector. With further Pd-intercalations, the system evolves from 2-fold symmetry to 4-fold symmetry with two CDW vectors, and eventually into superconducting state. The evolution of the CDW gap symmetry, gap size and CDW caused shadow bands are discussed at different phases.