Journal
JOURNAL OF PHYSICS-CONDENSED MATTER
Volume 31, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1361-648X/aaedee
Keywords
density-functional theory; electronic structure; theoretical spectroscopy; alkali antimonides
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We present a comprehensive first-principles investigation of the electronic and optical properties of CsK2Sb, a semiconducting material for ultra-bright electron sources for particle accelerators. Our study, based on density-functional theory and many-body perturbation theory, provides all the ingredients to model the emission of this material as a photocathode, including band gap, band dispersion, and optical absorption. An accurate description of these properties beyond the mean-field picture is relevant to take into account many-body effects. We discuss our results in the context of state-of-the-art electron sources for particle accelerators to set the stage towards improved modeling of quantum efficiency, intrinsic emittance, and other relevant quantities determining the macroscopic characteristics of photocathodes for ultra-bright beams.
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