aDepartment of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, Changsha 410081, China
bHunan Joint International Laboratory of Advanced Materials and Technology for Clean Energy, Hunan University, Changsha 410082, China
*Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Key Laboratory for Matter Microstructure and Function of Hunan Province, Hunan Normal University, Changsha 410081, China. E-mail addresses:
fyu@hunnu.edu.cn (F. Yu),
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