Affiliation: | HOU BI-HUI (Department of Physics, University of Science and Technology of China, Hefei 230026, PRC) JIN TONG-ZHENG XU YUN-XIA (Laboratory of Solid State Microstructures, Nanjing University, Nanjing 210008, PRC) ZHOU GUI-EN (Center of Structure Analysis, University of Science and Technology of China, Hefei 230026, PRC) AND QI ZHEN-ZHONG (Intitute of Solid State Physics, Academia Sinica, Hefei 230031, PRC) |