These codes calculate the temperature-dependent polaron mobility for a material. We have parameters for various metal-halide Perovskite.
More extensive documentation is available , which is perhaps easiest to read and understand alongside the pre-print: ArXiv:1704.05404 .
The scientific inputs are the dielectric constants, a characteristic phonon frequency, and the bare-electron band effective-mass.
From this you can solve a temperature-dependent polaron model (variationally optimising temperature-dependent free-energies for the coupled electron-phonon system), and from this optimised parameters calculate derivative quantities such as the polaron mobility, and polaron features (effective masses, energy loss rates, oscillation etc.)
May your phonons drag in a manner truly sublime.
Polaron mobilities, three different ways
Effective mass of phonon cloud
Spring constant for coupling to phonon cloud
Variational (temperature-dependent free-energy) parameters for the coupled system