Systematic ARPES study of Ln$_x$Bi$_2$Sr$_{2-x}$CuO$_{6+\delta}$

Ln$_{x}$Bi$_{2}$Sr$_{2-x}$CuO$_{6+\delta}$ is a good candidate to investigate the effects of charge doping and potential disorder to the properties of the high-Tc cuprates. The samples with different Ln elements exhibits very different property, and can used as a probe to study the superconductivity with different Ln substitutions. High-quality single crystals of Ln$_{x}$Bi$_{2}$Sr$_{2-x}$CuO$_{6+\delta}$(Bi and La) have been synthesized over a wide substitution range. We will report our high-resolution ARPES results on of Ln$_{x}$Bi$_{2}$Sr$_{2-x}$CuO$_{6+\delta}$.