Yingxin Wang†, Yingying Niu†, Meng Chen†, Jianguo Wen‡, Weidong Wu†, Yingkang Jin‡, Dong Wu*§, and Ziran Zhao*†
† Key Laboratory of Particle & Radiation Imaging (Tsinghua University), Ministry of Education, Department of Engineering Physics, Tsinghua University, Beijing, 100084, China
‡ Nuctech Company Limited, Beijing 100084, China
§ International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China