Fig. 3.

Rotational symmetry of chiral polar arrays observed in azimuthal pattern of XCD. (A) XCD intensity plotted versus azimuth, ϕ_spot, for each diffraction spot from the polar arrays. Red circles indicate XCD > 0; blue squares indicate XCD < 0. Filled markers were measured at n_SL = 4; hollow markers were measured at n_SL = 3. Gray regions show experimentally inaccessible sample geometries. (B) Diffraction patterns for two sample orientations (separated by 180° azimuthally) exhibit similar XCD (red and blue circles) relative to the scattering geometry: Φ = 0° (Left) and 180° (Right). Curved arrows indicate ϕ_spot, measured from the in-plane projection (dashed green arrow) of the incoming X-rays. Sample is depicted with counterrotated polarization cores (small black arrows) and alternating axial polarization (green and magenta) domains. (C) Polarization structure is averaged over both orientations in the (010)_χ cross-section. These polar cores possess a chiral texture that is robust versus a twofold rotation. Error bars in A represent uncertainty in fitting the XCD spectra at each azimuth (Azimuthal XCD Measurements).