Altermagnetism produces pair emission and absorption from dark excitons and magnons in La${}_2$O${}_3$Mn${}_2$Se${}_2$

Birender Singh, Xian Xu, Sabrina R. Hatt +21

Altermagnets' (AMs) non-relativistic spin splitting enables novel states, spintronic and magneto-optical devices, though their optical signatures remain elusive. Here, we report ex…