Acknowledgment

This work was supported by the National Key R&D Program of China (Grant No. 2017YFA0304000), Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB04010200), the National Natural Science Foundation of China (Grant Nos. 91121022, 61401441, and 61401443), and the Science and Technology Commission of Shanghai Municipality (Grant No. 16JC1400402). The authors would like to thank M. Wang, Z. J. Li, and B. Gao from SIMIT for technical support during the ultra-low temperature measurements.

Supplement

The supporting information is available online at http://phys.scichina.com and http://link.springer.com/journal/11433. The supporting materials are published as submitted, without typesetting or editing. The responsibility for scientific accuracy and content remains entirely with the authors.

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