1. Department of Physics, Sapienza University of Rome, P.le Aldo Moro 5, I-00185 Rome, Italy and Department of Chemistry, École Normale Supérieure, Rue Lhomond 24, 75005 Paris, France
2. Department of Physical and Chemical Sciences, University of L’Aquila, Via Vetoio 10, 67100 L’Aquila, Italy and Maison de la Simulation, CEA, CNRS, Université Paris-Sud, UVSQ, Université Paris-Saclay, 91191 Gif-sur-Yvette, France
3. Instituto per le Applicazioni del Calcolo “Mauro Picone” (IAC), CNR, Via dei Taurini 19, I-00185 Rome, Italy; Sapienza University of Rome, P.le Aldo Moro 5, I-00185 Rome, Italy; and University College Dublin (UCD), Belfield Dublin 4, Ireland
4. Department of Physics, Université Libre de Brussels (ULB), Campus Plaine, CP 223, B-1050 Brussels, Belgium