1. Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, 800 Dongchuan Road, Shanghai 200240, China
2. School of Physical Science and Technology, Southwest University, Chongqing 400715, China
3. Faculty of Science, Department of Physical and Macromolecular Chemistry, Charles University, Prague 12843, Czech Republic
4. School of Science, Inner Mongolia University of Technology, Hohhot 010051, China