Defects in magnetic Weyl semimetal Co3Sn2S2*

In Co3Sn2S2, a magnetic Weyl semimetal with kagome-lattice, the existence of bulk Weyl nodes, which are formed under broken inversion or time-reversal symmetry, creates nontrivial topological properties, for example, robust Giant anomalous hall effect. The surface–bulk correspondence ensures the bulk bands related topological “Fermi arc” surface bands dispersion. In this presentation, we use low temperature high magnetic field scanning tunneling microscope, spin polarized STM, and quasiparticle interference (QPI) to study the influence of local defects including magnetic and nonmagnetic vacancies and adatoms to the Weyl nodes movement. Co and Sn vacancies in the Kagome-lattice are identified, their behavior under magnetic field are studied. S adatoms in 1D forms are compared with individual adatoms. The interplay among topology, defects and magnetism are discussed for the understanding of the involved quantum phenomena.