contactpp generates pseudopotentials for interparticle interactions which accurately reproduce the contact potential. Potentials can be generated to reproduce the bound state, or scattering states with either positive or negative scattering lengths. This program currently only offers norm-conserving pseudopotentials in the form detailed by Troullier and Martins.

The formalism is detailed in [BLNC].

[BLNC]P. O. Bugnion, P. López Ríos, R. J. Needs and G. J. Conduit, High-fidelity pseudopotentials for the contact interaction.