1. Institute of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany
2. Erlangen Graduate School in Advanced Optical Technologies (SAOT), Friedrich-Alexander-Universität Erlangen-Nürnberg, 91052 Erlangen, Germany
3. Institute of Advanced Materials (INAM), Universitat Jaume I, 12006 Castelló, Spain
4. SISSA International School for Advanced Studies and INFN, 34136 Trieste, Italy
5. Departamento de Física, Universidad de Pinar del Río, 20100 Pinar del Río, Cuba
6. The Abdus Salam International Centre for Theoretical Physics, 34014 Trieste, Italy