Fig. 2: Directional dichroism for different measurement symmetries.
From: Nonreciprocal directional dichroism of a chiral magnet in the visible range
a, d Schematic view of H and k relative to the chiral axis of Ni3TeO6 in the magnetochiral orientation. b Magneto-optical response as measured by the absorption difference at full field, Δα = α(H = ±62 T) − α(H = 0 T). Data in the +H direction are different than those in the −H direction. c Nonreciprocal directional dichroism of Ni3TeO6 in the metamagnetic phase in the magnetochiral orientation, obtained by reversing the field direction with fixed k. Thus, ΔαNDD = α+H(62 T) − α−H(−62 T), which is the same as Δα+H(62 T) − Δα−H(−62 T). For reference in c, f we include the linear absorption spectrum α. e, f Similar Δα and ΔαNDD spectra are obtained by reversing the light propagation direction under constant field. Here, Δα is α(H = +62 T) − α(H = 0 T) for up/down k, and ΔαNDD is αupk − αdownk, which is the same as Δαupk − Δαdownk with H = +62 T. g, j Schematic view of H and k relative to the chiral axis of Ni3TeO6 in the transverse magnetochiral orientation. h, i Magneto-optical and nonreciprocal directional dichroism of Ni3TeO6 at 62 T in the transverse magnetochiral orientation obtained by reversing the field direction under constant k. For reference in i, l, we include the linear absorption spectrum. k, l Similar Δα and ΔαNDD spectra are obtained by reversing the light propagation direction under constant field.
