First-principles calculations show that breaking mirror symmetry in a non-Janus altermagnet monolayer Fe2WS2Se2 spontaneously lifts valley degeneracy, a mechanism the authors call type III valley polarization.
Valley-selective circular dichroism of monolayer molybdenum disulphide
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Type III Valley Polarization and Anomalous Valley Hall Effect in Two-Dimensional Non-Janus and Janus Altermagnet Fe2WS2Se2
First-principles calculations show that breaking mirror symmetry in a non-Janus altermagnet monolayer Fe2WS2Se2 spontaneously lifts valley degeneracy, a mechanism the authors call type III valley polarization.