Acknowledgements
This work was founded by the Peacock Science and Technology Innovation
Project of Shenzhen (KQJSCX20170328153821275), the National Science
Foundation of China (31601230), the Key University Science Research
Project of Jiangsu Province (17KJA210002), and Priority Academic Program
Development of Jiangsu Higher Education Institutions. We thank Prof.
Cunxu Wei and Dr. Juan Wang for the fruitful discussions and valuable
suggestions on this study.