1. IHP, Im Technologiepark 25, 15236 Frankfurt (Oder), Germany
2. Electronic Materials Research Laboratory, Key Laboratory of the Ministry of Education & International Center for Dielectric Research, Xi’an Jiaotong University, Xi’an 710049, China
3. Dipartimento
di Scienze, Università Roma Tre, Viale Marconi 446, 00146 Rome, Italy
4. Technische
Universität Berlin, Institut für Optik und Atomare Physik, Straße des 17 Juni 135, 10623 Berlin, Germany
5. L-NESS
and Department of Materials Science, Università degli Studi di Milano−Bicocca, via Cozzi 55, I-20125 Milan, Italy
6. Department
of Materials Science and Engineering, University of California at Los Angeles, Los
Angeles, California 90095-1595, United States
7. BTU Cottbus-Senftenberg, Konrad-Zuse-Straße 1, 03046 Cottbus, Germany