Fermi-arc diversity on surface terminations of the magnetic Weyl semimetal Co 3 Sn 2 S 2

Magnetic Weyl semimetals Weyl semimetals (WSMs)—materials that host exotic quasiparticles called Weyl fermions—must break either spatial inversion or time-reversal symmetry. A number of WSMs that break inversion symmetry have been identified, but showing unambiguously that a material is a time-reversal-breaking WSM is tricky. Three groups now provide spectroscopic evidence for this latter state in magnetic materials (see the Perspective by da Silva Neto). Belopolski et al. probed the material Co 2 MnGa using angle-resolved photoemission spectroscopy, revealing exotic drumhead surface states. Using the same technique, Liu et al. studied the material Co 3 Sn 2 S 2 , which was complemented by the scanning…

• US
  United States - Israel Binational Science Foundation

  Award: 2016389
• LM
  Leona M. and Harry B. Helmsley Charitable Trust

  Award: 2018PG-ISL006
• GF
  German-Israeli Foundation for Scientific Research and Development

  Award: I-1364-303.7/2016