Correlating local chemistry with electronic structure in magnetic Weyl semimetal Co₃Sn₂S₂

Ultraviolet Angle-resolved photoemission spectroscopy (ARPES) is a surface sensitive technique, often probing only a few atomic layers below the surface, limited by the inelastic mean free path of the photoelectrons. Yet it remains a powerful and ubiquitous technique for direct visualization of electronic structure. This limitation often results in interesting interplay between local surface features and observed electronic structure. Importantly, topological quantum materials often have defining surface electronic structure which depends on the morphology of the exposed surface, necessitating simultaneous quantitative measurement of both the local surface chemistry and electronic structure. In this work we study the magnetic Weyl semimetal Co₃Sn₂S₂ using ARPES and x-ray photoelectron spectroscopy (XPS) to establish how local surface chemistry, topological electronic structure, and strong electronic correlations interact with one another.