Supported by the National Key Research and Development Program of China under Grant No 2016YFA0300300;the National Natural Science Foundation of China under Grant No 11334010;the National Basic Research Program of China under Grant No2015CB921300;the Strategic Priority Research Program(B)of the Chinese Academy of Sciences under Grant No XDB07020300
We carry out detailed momentum-dependent and temperature-dependent measurements on Bi_(2)Sr_(2)CaCu_(2)O_(8+δ)(Bi2212)superconductor in the superconducting and pseudogap states by super-high resolution laser-based an...