1. Jiangsu Key Laboratory of Thin Films, School of Physical Science and Technology, Soochow University, 1 Shizi Street, Suzhou 215006, China
2. School of Materials Science and Engineering, Nanyang Technological University, 639798 Singapore
3. Siyuan Laboratory, Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials, Department of Physics, Jinan University, Guangzhou, Guangdong 510632, People’s Republic of China
4. Physics Department, National University of Singapore, Block S12, #2 Science Drive 3, 117551 Singapore
5. Department of Physics, Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, Guangdong, China