1. Okinawa Institute of Science and Technology Graduate University, 1919-1 Tancha, Onna-Son, Okinawa, 904-0495, Japan
2. Department of Physics, Aristotle University of Thessaloniki, GR-54124 Thessaloniki, Greece
3. Department of Materials Sciences and Engineering, Guangdong Technion – Israel Institute of Technology, Shantou, Guangdong 515063, China
4. Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion, Guangdong Technion – Israel Institute of Technology, Shantou, Guangdong 515063, China