Pitch-controlled reorientational nonlinearity in chiral nematic liquid crystals: A reduced-order model for self-focusing and soliton formationRemoveHoma Saadatmand, M. Javad Zakeri, Ahmed Sameh Ahmed, Suraj Bhandari, Loubna Benkoula, Ameer B. Batarseh, Andrea Blanco-Redondo, Miroslaw Karpierz, and Pawel S. JungPhys. Rev. A 113, 033511 (2026)