Wronskian representation of second-order Darboux transformations for Schrödinger equations with quadratically energy-dependent potentials

Abstract
We construct a Wronskian representation of second-order Darboux transformations for Schrodinger-type equations that feature quadratically energy-dependent potentials. Besides generalizing the conventional Darboux transformation of second order, our results can be adapted to generate zero-energy solutions to the massless Dirac equation in two dimensions.

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