1. Department of Physics and Astronomy, University of Texas at San Antonio, San Antonio, TX 78249, USA
2. Key Lab of Materials Modification by Laser, Ion, Electron Beams, Dalian University of Technology, Dalian 116024, P. R. China
3. The Texas Center for Superconductivity, University of Houston, Houston, TX 77204, USA
4. Department of Electrical and Computer Engineering, University of Dayton, Dayton, Ohio 45469, USA
5. State Key Laboratory of Electronic, Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, P. R. China
6. Department of Material Science and Engineering, University of Texas at Arlington, Arlington, TX 76019, USA
7. Department of Electrical and Computer Engineering, University of Texas at San Antonio, San Antonio, TX 78249, USA