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1 Department of Materials Science and Engineering, University of California, Los Angeles, California, USA.
2 Institute of Semiconductors, Chinese Academy of Sciences, and also at the College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing, China.
1 Department of Materials Science and Engineering, University of California, Los Angeles, California, USA.
2 Institute of Semiconductors, Chinese Academy of Sciences, and also at the College of Materials Science and Opto-electronic Technology, University of Chinese Academy of Sciences, Beijing, China.