ALGEBRAIC CONSTRUCTION OF ASSOCIATED FUNCTIONS OF NONDIAGONALIZABLE MODELS WITH ANHARMONIC OSCILLATOR COMPLEX INTERACTION

A shape invariant nonseparable and nondiagonalizable two-dimensional model with anhar-monic complex interaction, first studied by Cannata, Ioffe, and Nishnianidze, is re-examined with the purpose of providing an algebraic construction of the associated functions to the excited-state wavefunctions, needed to complete the basis. The two operators A+ and A-, coming from the shape invariant supersymmetric approach, where A+ acts as a raising operator while A- annihilates all wavefunctions, are completed by introducing a novel pair of operators B+ and B-, where B- acts as the missing lowering operator. It is then shown that building the associated functions as polynomials in A+ and B+ acting on the ground state provides a much more efficient approach than that used in the original paper. In particular, we have been able to extend the previous results obtained for the first two excited states of the quartic anharmonic oscillator either by considering the next three excited states or by adding a cubic or a sextic term to the Hamiltonian.

Automated summary

This paper re-examines a shape invariant nonseparable and nondiagonalizable two-dimensional model with anharmonic complex interaction and provides an algebraic construction of the associated functions to the excited-state wavefunctions. The introduction of a novel pair of operators complements the existing raising and lowering operators, making the construction of associated functions more efficient. The results obtained extend the previous findings for the quartic anharmonic oscillator by considering additional excited states or adding higher order terms to the Hamiltonian.