Angle-resolved photoemission spectroscopy (ARPES) is a powerful experimental technique used to study the electronic structure of materials. It provides information about the energy and momentum of electrons in a solid. The technique involves the following key steps: 1. **Photon Emission**: ARPES utilizes high-energy photons (typically from a synchrotron radiation source or lasers) to irradiate a material. When these photons interact with the material, they can eject electrons from the surface.
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