arXiv:1002.2972v1 [cond-mat.supr-con] 15 Feb 2010 1 PACS numbers: 74.72.Hs, 79.60.-i, 71.30.+h La-doped and Y-doped Bi$_{2}$Sr$_{2}$CaCu$_{2}$O$_{8+}$$_{δ}$ (Bi2212) compounds Bi$_{2}$Sr$_{2}$$_{−}$$_{x}$La$_{x}$(Ca,Y)Cu$_{2}$O$_{8+}$$_{δ}$, which range from the insulator to the deeply underdoped superconductor, have been studied by angle-resolved photoemission spectroscopy. We have observed that the lower Hubbard band (LHB) of the parent insulator is gradually shifted upward with doping without significantly changing the band dispersions, which implies a downward shift of the chemical potential with hole doping. This behaviour is analogous to Bi$_{2}$Sr$_{2}$$_{−}$$_{x}$La$_{x}$CuO$_{6+}$$_{δ}$ (Bi2201) and Ca$_{2}$$_{−}$$_{x}$Na$_{x}$CuO$_{2}$Cl$_{2}$ (Na-CCOC) but is different from La$_{2}$$_{−}$$_{x}$Sr$_{x}$CuO$_{4}$ (LSCO), where the LHB stays well below the chemical potential and does not move while its intensity quickly diminishes in the underdoped region. Evolution of the electronic structure from the insulator to the superconductor in Bi$_{2}$Sr$_{2}$$_{−}$$_{x}$La$_{x}$(Ca,Y)Cu$_{2}$O$_{8+}$$_{δ}$ Abstract K. Tanaka, 1 T. Yoshida, 1 K.M. Shen, 2 , 3 D.H. Lu, 2 W.S. Lee, 2 H. Yagi, 1 A. Fujimori, 1 Z.-X. Shen, 2 Risdiana, 4 T. Fujii, 4 , 5 and I. Terasaki 4 $^{1}$Department of Physics, University of Tokyo, Hongo, Tokyo 113-0033, Japan $^{2}$Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305, USA $^{3}$Department of Physics, Laboratory of Atomic and Solid State Physics, Cornell University, Ithaca NY 14853, USA $^{4}$Department of Applied Physics, Waseda University, Tokyo 169-8555, Japan $^{5}$Cryogenic Center, University of Tokyo, Bunkyo-ku, Tokyo 113-0032, Japan (Dated: October 29, 2018)