Abstract We consider the three-dimensional stationary Schrödinger equation deformed by Dunkl operators, and constrained to the surface of a torus. After separation of variables in toroidal coordinates, it is shown that the Schrödinger equation admits solutions in terms of Heun functions, provided the potential has a certain form. As an application, elementary solutions of bound-state type are constructed that are expressed through Heun polynomials.
Axel Schulze-Halberg (2026) studied this question.