In a recent paper [Physical Review E 98, 052221 (2018)], E. Díaz et al introduce an effective model for electron transport in a deformable helical molecular lattice that resembles the nonlinear Kronig-Penney model in the adiabatic approximation. In addition, the continuum limit of the model is achieved when the dipole-dipole distance is smaller than the spatial extent of the bright soliton, as discussed by E. Díaz et al. [N. J. Phys. 20, 043055 (2018)]. In this limit, the model reduces to an extended Davydov model. Finally, they also focus on perturbations to the bright soliton that arise naturally in the context of real helical molecules. They conclude that the continuum approximation provides excellent results in more complex scenarios.

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