1. State Key Laboratory of Metal Matrix CompositesShanghai Jiao Tong University Shanghai 200240 China
2. Department of PhysicsWashington University in St. Louis One Brookings Drive St. Louis MO 63130 USA
3. Department of PhysicsShanghai Normal University 100 Guilin Road Shanghai 200234 China
4. Adamco Inc. 2223 Watts Street Houston TX 77030 USA
5. CRRC Industrial Institute Co., Ltd. Beijing 100067 China