The singular and the 2:1 anisotropic Dunkl oscillators in the plane

TL;DR

This paper studies two Dunkl oscillator models with reflection symmetries, revealing their superintegrability, algebraic spectra, and symmetry algebras, with solutions expressed via special functions and separation of variables in specific coordinate systems.

Contribution

It introduces and analyzes the singular and 2:1 anisotropic Dunkl oscillators, detailing their algebraic spectra, symmetry structures, and separation properties, extending the understanding of Dunkl oscillator models.

Findings

Both models are second-order superintegrable.

Spectra are obtained algebraically for both models.

Symmetry algebras are quadratic and related to known special function algebras.

Abstract

Two Dunkl oscillator models are considered: one singular and the other with a 2:1 frequency ratio. These models are defined by Hamiltonians which include the reflection operators in the two variables x and y. The singular or caged Dunkl oscillator is second-order superintegrable and admits separation of variables in both Cartesian and polar coordinates. The spectrum of the Hamiltonian is obtained algebraically and the separated wavefunctions are given in the terms of Jacobi, Laguerre and generalized Hermite polynomials. The symmetry generators are constructed from the su(1,1) dynamical operators of the one-dimensional model and generate a cubic symmetry algebra. In terms of the symmetries responsible for the separation of variables, the symmetry algebra of the singular Dunkl oscillator is quadratic and can be identified with a special case of the Askey-Wilson algebra AW(3) with central involutions. The 2:1 anisotropic Dunkl oscillator model is also second-order superintegrable. The energies of the system are obtained algebraically, the symmetry generators are constructed using the dynamical operators and the resulting symmetry algebra is quadratic. The general system appears to admit separation of variables only in Cartesian coordinates. Special cases where separation occurs in both Cartesian and parabolic coordinates are considered. In the latter case the wavefunctions satisfy the biconfluent Heun equation and depend on a transcendental separation constant.