1. Institute of Theoretical Chemistry, Faculty of Chemistry, University of Vienna, Währinger Straße 17, 1090 Vienna, Austria
2. Vienna Doctoral School in Physics, University of Vienna, Boltzmanngasse 5, 1090 Vienna, Austria
3. Computational Materials Physics, Faculty of Physics, University of Vienna, Kolingasse 14-16, 1090 Vienna, Austria
4. Department of Physics and Astronomy ’Augusto Righi’, Alma Mater Studiorum─Università di Bologna, Bologna 40127, Italy