[1] Nanyang Technol Univ, Sch Elect & Elect Engn, Singapore 639798, Singapore
[2] Univ Elect Sci & Technol China, State Key Lab Elect Thin Films & Integrated Devi, Chengdu 610054, Sichuan, Peoples R China
[3] Harbin Inst Technol, Sch Astronaut, Ctr Composite Mat, Harbin 150080, Peoples R China
[4] Nanyang Technol Univ, Sch Mech & Aerosp Engn, Singapore 639798, Singapore
[5] Univ Hong Kong, Dept Phys, Hong Kong, Hong Kong, Peoples R China