Designable integrability of the variable coefficient nonlinear Schr'odinger equation

The designable integrability(DI) of the variable coefficient nonlinear Schr"odinger equation (VCNLSE) is first introduced by construction of an explicit transformation which maps VCNLSE to the usual nonlinear Schr"odinger equation(NLSE). One novel feature of VCNLSE with DI is that its coefficients can be designed artificially and analytically by using transformation. A special example between nonautonomous NLSE and NLSE is given here. Further, the optical super-lattice potentials (or periodic potentials) and multi-well potentials are designed, which are two kinds of important potential in Bose-Einstein condensation(BEC) and nonlinear optical systems. There are two interesting features of the soliton of the VCNLSE indicated by the analytic and exact formula. Specifically, its the profile is variable and its trajectory is not a straight line when it evolves with time $t$.

💡 Research Summary

The paper introduces the concept of “designable integrability” (DI) for the variable‑coefficient nonlinear Schrödinger equation (VCNLSE). By constructing an explicit transformation that maps a VCNLSE onto the standard constant‑coefficient nonlinear Schrödinger equation (NLSE), the authors show that the spatial‑temporal coefficients of the VCNLSE can be engineered analytically while preserving complete integrability.

The transformation has the form
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