Disorder-Controlled Surface Electronic Structure in Co₃Sn₂S₂ Visualized by ARPES and XPS

Co₃Sn₂S₂ is a magnetic Weyl semimetal with correlated electrons in which characteristic surface states present differently when different atomic planes terminate the crystal. The distinct togological and trivial surface states have been successfully measured, however, a model of pure terminations is known to be inadequate because of the abundance of spatial heterogeneity and point disorders on surface. We will discuss our spectromicroscopy study on surface chemistry and electronic structure using photoemission measurements. Here we identify an intermediate region with properties distinct from both pure terminations, and demonstrate that the spectral features in this region can be associated with a disordered termination with a varying density of surface vacancies.