1School of Physics and Astronomy, China West Normal University, Nanchong, Sichuan 637002, People’s Republic of China
2Department of Physics, Key Laboratory of Low Dimensional Quantum Structures and Quantum Control of Ministry of Education, and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha, Hunan 410081, People’s Republic of China
3Department of Physics and Astronomy, University of Waterloo, Waterloo, Ontario N2L 3G1, Canada
