8. `models`: Model systems

8.1. `lib.aggregates`: Disordered exciton

8.2. `lib.hh_model`: Hubbard-Holdstein

8.3. `lib.hubbard`: Hubbard

8.4. `lib.shin_metiu`: Shin-Metiu

8.5. `lib.ssh`: Su-Schrieffer-Heeger