# Revisiting generalized Hulth\'en potentials

## TL;DR

This paper explores the relationship between deformed Hulthén and Eckart potentials, deriving new extended potentials and their spectra using supersymmetric quantum mechanics and rational extensions.

## Contribution

It introduces novel extended deformed Hulthén potentials by leveraging the shape invariance of the Eckart potential and known rational extensions, providing explicit spectra and wavefunctions.

## Key findings

- Derived bound-state wavefunctions in terms of Jacobi polynomials.
- Rederived extended potentials using shape invariance without extra calculations.
- Constructed new potential extensions with specific spectral properties.

## Abstract

A relation between the deformed Hulth\'en potential and the Eckart one is used to write the bound-state wavefunctions of the former in terms of Jacobi polynomials and to calculate their normalization coefficients. The shape invariance property of the Eckart potential in standard first-order supersymmetric quantum mechanics allows to easily rederive the set of extended deformed Hulth\'en potentials, recently obtained by using the Darboux-Crum transformation, and to show that their spectra and normalized wavefunctions follow without any further calculation. Furthermore, by taking advantage of other known rational extensions of the Eckart potential obtained in first-order supersymmetric quantum mechanics, novel extensions of the deformed Hulth\'en potential are constructed, together with their bound-state spectra and wavefunctions. These new extensions belong to three different types, the first two being isospectral to some previously obtained extensions and the third one with an extra bound state below their spectrum.