ARPES (Angle-Resolved Photoemission Spectroscopy) is a powerful experimental technique used in the field of condensed matter physics to study the electronic structure of materials. It involves shining a beam of high-energy photons onto a sample, causing electrons to be ejected from the material’s surface. By measuring the energy and angle of these emitted electrons, ARPES provides valuable insights into the energy levels and momentum of the electrons within the material. This allows researchers to understand the behavior of electrons in different materials, leading to a better understanding of their properties and potential applications. ARPES is a crucial tool in the study of materials such as superconductors, semiconductors, and topological insulators, and continues to play a vital role in advancing our understanding of the fundamental properties of matter.