1. UNAM–Institute of Materials Science and Nanotechnology Department of Electrical and Electronics Engineering Department of Physics Bilkent University Ankara 06800 Turkey
2. ITMO University School of Physics and Engineering St. Petersburg 197101 Russia
3. Experimentelle Physik 2 Technische Universität Dortmund 44227 Dortmund Germany
4. Qingdao Innovation and Development Center Harbin Engineering University Qingdao Shandong 266000 China
5. Department of Physics Bar‐Ilan University Ramat Gan 52900 Israel
6. LUMINOUS! Center of Excellence for Semiconductor Lighting and Displays School of Electrical and Electronic Engineering School of Physical and Materials Sciences School of Materials Science and Engineering Nanyang Technological University Singapore 639798 Singapore