1. Department of Mathematical Sciences, Politecnico di Torino , Torino, Italy
2. Centre Européen de Calcule Atomique et Moléculaire (CECAM), École Polytechnique Fédérale de Lausanne , Lausanne, Switzerland
3. Department of Mathematical Sciences and Graphene@PoliTO Lab, Politecnico di Torino , Torino, Italy
4. Istituto Nazionale di Fisica Nucleare, Sezione di Torino , Torino, Italy
5. Institute for Applied Computing “Mauro Picone” (IAC), CNR , Rome, Italy
6. School of Physics, University College of Dublin UCD-Belfield , Dublin, Ireland
7. Department of Physics, Università di Roma La Sapienza , Rome, Italy