Evolution of the electronic structure from the insulator to the superconductor in Bi2212 cuprates

ORAL

Abstract

We have performed angle-resolved photoemission study of Bi$_2 $Sr$_{2-x}$La$_x$CaCu$_2$O$_{8+\delta}$ (Bi2212) cuprates from the lightly-doped to the underdoped region, which can be achieved by a recent progress in sample synthesis. We found that the lower Hubbard band (LHB) of the parent insulator is gradually shifted upward with hole doping without changing the global dispersions, which indicates a shift of the chemical potential with hole doping. This behavior is analogous to that in 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 in the underdoped region. The details of the electronic structure for different families of cuprates will also be compared from the viewpoint of doping dependence of the quasiparticle band and the $k_{F}$ position and the observed difference will be discussed.

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Authors

  • Kiyohisa Tanaka

  • Teppei Yoshida

    • Univ. of Tokyo

  • Kyle Shen

    • Stanford University

  • Donghui Lu

    • Stanford Synchrotron Radiation Laboratory
    • Stanford University

  • Wei-Sheng Lee

    • Department of Physics, Stanford University
    • Stanford Univ.

  • Hajime Yagi

    • University of Tokyo

  • Atsushi Fujimori

    • Univ. of Tokyo
    • University of Tokyo

  • Zhi-Xun Shen

    • Department of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University
    • Stanford Univ.
    • Department of Physics, Department of Applied Physics and Stanford Synchrotron Radiation Laboratory, Stanford University, Stanford, CA 94305
    • Departments of Physics, Applied Physics and Stanford Synchrotron Radiation Laboratory
    • Stanford University

  • . Risdiana

  • Takenori Fujii

  • Ichiro Terasaki

    • Waseda Univ.