1 State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, 100084, Beijing, China.
2 Institute of Physics, Chinese Academy of Science, 100190, Beijing, China.
3 State Key Lab of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, 100084, Beijing, China.
4 Department of Electronic Science and Engineering, Nankai University, 300071, Tianjin, China.
5 Collaborative Innovation Center of Quantum Matter, 100084, Beijing, China.
6 School of Physical Sciences, University of Chinese Academy of Sciences, 100049, Beijing, China.
7 State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics, Tsinghua University, 100084, Beijing, China. yupu@mail.tsinghua.edu.cn.
8 Collaborative Innovation Center of Quantum Matter, 100084, Beijing, China. yupu@mail.tsinghua.edu.cn.
9 RIKEN Center for Emergent Matter Science (CEMS), 351-0198, Saitama, Japan. yupu@mail.tsinghua.edu.cn.
In the original version of this Article, Figs. 4c and 4d contained incorrectly sized error bars. This has now been corrected in both the PDF and HTML versions of the Article.