1. Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
2. Center Énergie Matériaux et Télécommunications, Institut National de la Recherche Scientifique (INRS), Canada
3. Department of Physics, City University of Hong Kong, Hong Kong SAR, China
4. College of Physics, Jilin University, Changchun 130012, China