1. Department of Chemistry and Pharmacy and Joint Institute of Advanced Materials and Processes (ZMP), Friedrich-Alexander University of Erlangen−Nuremberg, Nikolaus-Fiebiger-Strasse 10, 91058 Erlangen, Germany
2. School of Physical Sciences and Nanotechnology, Yachay Tech University, 100119 Urcuquı́, Ecuador
3. Department of Physics, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany