1. State Key Lab for Metal Matrix Composites, Key Lab of Artificial Structures and Quantum Control (Ministry of Education), Shenyang National Laboratory for Materials Science, School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, People’s Republic of China
2. Collaborative Innovation Center of Advanced Microstructures, Nanjing, People’s Republic of China
3. Experimental Physics, Saarland University, P.O. Box 151150, 66041 Saarbrücken, Germany