1. School of PhysicsUniversity of Electronic Science and Technology of China Chengdu 610054 P. R. China
2. School of Optoelectronic Science and EngineeringUniversity of Electronic Science and Technology of China Chengdu 611731 P. R. China
3. School of Materials and EnergyUniversity of Electronic Science and Technology of China Chengdu 610054 P. R. China
4. Institute for Superconducting and Electronic MaterialsAustralian Institute for Innovative MaterialsUniversity of Wollongong North Wollongong 2500 Australia
5. State Key Laboratory of Electronic Thin Film and Integrated DevicesUniversity of Electronic Science and Technology of China Chengdu 610054 P. R. China
6. National Key Laboratory of Science and Technology on Advanced Composites in Special EnvironmentsCenter for Composite Materials and StructuresHarbin Institute of Technology Harbin 150080 P. R. China