Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;
School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;
Department of Physics and Beijing Key Laboratory of Opto-electronic Functional Materials and Micro-nano Devices, Renmin University of China, Beijing 100872, China;
Department of Physics&Astronomy, Rice Center for Quantum Materials, Rice University, Houston, Texas 77005, USA;