High-temperature superconductivity in monolayer Bi2Sr2CaCu2O8+δ

Acknowledgements We thank D.-H. Lee, Z.-Y. Weng, Q.-K. Xue, S.-W. Cheong, Y. Wang, H. Ding 
and H. Luo for discussions. We also thank X. Jin and D. Feng for their help with the experiment. 
Part of the sample fabrication was conducted at Nano-fabrication Laboratory at Fudan 
University. Work at Brookhaven National Laboratory was supported by the Office of Science, 
US Department of Energy under contract no. DE-SC0012704. Y.Y., L.M. and Y.Z. acknowledge 
support from the National Key Research Program of China (grant nos. 2016YFA0300703, 
2018YFA0305600), National Science Foundation of China (grant nos. U1732274, 11527805, 
11425415 and 11421404), Shanghai Municipal Science and Technology Commission (grant no. 
18JC1410300) and Strategic Priority Research Program of Chinese Academy of Sciences (grant 
no. XDB30000000). Y.Y. acknowledges support from the National Postdoctoral Program for 
Innovative Talents (grant no. BX20180076) and China Postdoctoral Science Foundation (grant 
no. 2018M641907). P.C. acknowledges support from National Postdoctoral Program for 
Innovative Talents (grant no. BX201600036), Shanghai Sailing Program (grant no. 
17YF1429000), Shanghai Municipal Natural Science Foundation (grant no. 17ZR1442400) and 
China Postdoctoral Science Foundation (grant no. 2017M610221). X.H.C. acknowledges 
support from the National Science Foundation of China (grant no. 11888101, 11534010), the 
National Key R&D Program of China (grant no. 2017YFA0303001 and 2016YFA0300201), 
Strategic Priority Research Program of the Chinese Academy of Sciences (grant no. 
XDB25000000) and the Key Research Program of Frontier Sciences, CAS (grant no. QYZDY-
SSW-SLH021).
Author contributions The order of the first two authors was determined arbitrarily. Y.Z. 
conceived the project. Y.Z. and X.H.C. supervised the experiments. R.Z. and G.D.G. synthesized 
bulk crystals. Y.Y., L.M. and C.Y. developed sample fabrication techniques. Y.Y. did transport 
measurements. L.M. led the STM study. L.M., P.C. and C.Y. did STM measurements 
and J.S. provided support. Y.Y., LM., P.C. and Y.Z. analysed the data and wrote the paper with 
input from all authors.