2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/80061In this letter we describe a new and simple approach for modulating the electromagnetic wave propagating in a dielectric medium in the form of solitons by considering the torque developed between the induced dipoles in the medium and external field without taking into account the nonlinear Kerr effect. A reductive perturbation method deduces the Maxwell equation coupled with the Larmor equation of the torque to the derivative nonlinear Schrödinger equation that admits optical solitons in the medium.RevTex format;12pages;1 figure;submitted to Physical Review LettersExactly Solvable and Integrable Systemstext