We thank the National Key R&D Program of China (No. 2017YFA0207302), the National Natural Science Foundation of China (Nos. 21890752, 21731005, 21420102001, and 21721001) and the 111 Project (No. B08027) for financial support. The computational work in the University of Jyväskylä was supported by the Academy of Finland through HH’s Academy Professorship and grants 292352, 319208. H. H. acknowledges support from China’s National Innovation and Intelligence Introduction Base visitor program. The computations were made at the CSC supercomputing center in Finland. We thank L. Feng from High-Field Nuclear Magnetic Resonance Research Center (Xiamen University) for the help in the NMR studies.
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