Affiliation: | 1. Key Laboratory of Polar Materials and Devices, Ministry of Education, and Department of Electronic Engineering, East China Normal University (ECNU), Dongchuan Road 500, Shanghai, 200241, China 2. School of Information and Communication Technology, Royal Institute of Technology (KTH), Stockholm, 16440, Sweden 3. Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China
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