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The subject of topological materials has attracted immense attention incondensed-matter physics, because they host new quantum states of mattercontaining Dirac, Majorana, or Weyl fermions. Although Majorana fermions canonly exist on the surface of topological superconductors, Dirac and Weylfermions can be realized in both 2D and 3D materials. The latter are semimetalswith Dirac/Weyl cones either not tilted (type I) or tilted (type II). Althoughboth Dirac and Weyl fermions have massless nature with the nontrivial Berryphase, the formation of Weyl fermions in 3D semimetals require eithertime-reversal or inversion symmetry breaking to lift degeneracy at Diracpoints. Here, we demonstrate experimentally that canted antiferromagneticBaMnSb2 is a 3D Weyl semimetal with a 2D electronic structure. The Shubnikov-deHass oscillations of the magnetoresistance give nearly zero effective mass withhigh mobility and the nontrivial Berry phase. The ordered magnetic arrangement(ferromagnetic ordering in the ab plane and antiferromagnetic ordering alongthe c axis below 286 K) breaks the time-reversal symmetry, thus offering us anideal platform to study magnetic Weyl fermions in a centrosymmetric material.

Nontrivial Berry phase in magnetic BaMnSb2 semimetal