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Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Peking University - Electron Microscopy Laboratory, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Peking University - Electron Microscopy Laboratory, Peking University - Electron Microscopy Laboratory, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics, Peking University - Electron Microscopy Laboratory and Chinese Academy of Sciences (CAS) - Beijing National Laboratory for Condensed Matter Physics