1. Center of NanoPhotonics and Department of Solid-State
Physics, Technische Universität Berlin, Hardenbergstraße 36, 10623 Berlin, Germany
2. Optoelectronic Materials and Technologies Engineering
Laboratory of Shandong, College of Mathematical and Physical Sciences, Qingdao University of Science and Technology, Qingdao 266061, China
3. Laboratory of Physics of Nanostructures, Ecole Polytechnique Fédérale de Lausanne, Lausanne 1015, Switzerland
4. King Abdulaziz University, Jeddah, Kingdom of Saudi Arabia