Dirac fermions in antiferromagnetic FeSn kagome lattices with combined space inversion and time reversal symmetry
The authors demonstrate experimentally the existence of theoretically predicted antiferromagnetic Dirac states in the kagome compound FeSn, where the $P$ and $T$ symmetries are individually broken but the combined $P\phantom{\rule{0}{0ex}}T$ symmetry is present. Moreover, their theoretical analysis reveals that, due to the salient antiferromagnetic structure, the Dirac fermions can be transformed into either massless/massive Weyl or massive Dirac fermions via symmetry manipulation, and the study does report the experimental observation of Weyl like cones at the surface driven by $P\phantom{\rule{0}{0ex}}T$ symmetry breaking that is induced by the Stark effect.