Extended Data Table 1 Theoretical values of natural optical activity in resonance with electromagnon modes

From: Giant chiral magnetoelectric oscillations in a van der Waals multiferroic

  1. Magnetoelectric coupling tensor elements αij of the EMo and EMe electromagnon modes obtained from ab initio calculations within the frozen-magnon approximation. Note that the couplings of EMo and EMe are imaginary and diagonal along their respective modulations axes \(\widehat{{\boldsymbol{\kappa }}} \sim (\widehat{{\bf{x}}}+\sqrt{2}\widehat{{\bf{z}}})/\sqrt{3}\) and \(\widehat{{\bf{y}}}\), highlighting natural optical activity.
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