1. Department of Physics, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China
2. Center for Integrated Spintronic Devices (CISD), Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, China
3. School of Computer Science, Jiangxi University of Traditional Chinese Medicine, Nanchang 330004, China
4. Department of Physics and Key Laboratory for Low-Dimensional Quantum Structures and Manipulation (Ministry of Education), Hunan Normal University, Changsha 410081, China