1. Department of Physics, State Key Laboratory for Metal Matrix Composites, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, P. R. China, Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, P.O. Box 603, Beijing 100080, P. R. China, Institute of Physics ASCR, v.v.i., Na Slovance 2, CZ-182 21 Praha 8, Czech Republic, and State Key Lab of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of...