Doping evolution of the electronic structure in the single-layer cuprates Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$: Comparison with other single-layer cuprates
We have performed angle-resolved photoemission and core-level x-ray photoemission studies of the single-layer cuprate Bi2Sr2−xLaxCuO6+δ (Bi2201) and revealed the doping evolution of the electronic structure from the lightly-doped to optimally-doped regions. We have observed the formation of the dispersive quasi-particle band, evolution of the Fermi ``arc'' into the Fermi surface and the shift of the chemical potential with hole doping as in other cuprates. The doping evolution in Bi2201 is similar to that in Ca2−xNaxCuO2Cl2 (Na-CCOC), where a rapid chemical potential shift toward the lower Hubbard band of the parent insulator has been observed, but is quite different from that in La2−xSrxCuO4 (LSCO), where the chemical potential does not shift, yet the dispersive band and the Fermi arc/surface are formed around the Fermi level already in the lightly-doped region. The (underlying) Fermi surface shape and band dispersions are quantitatively analyzed using tight-binding fit, and the deduced next-nearest-neighbor hopping integral t′ also confirm the similarity to Na-CCOC and the difference from LSCO.
@article{arxiv.0801.0782,
title = {Doping evolution of the electronic structure in the single-layer cuprates Bi$_2$Sr$_{2-x}$La$_x$CuO$_{6+\delta}$: Comparison with other single-layer cuprates},
author = {M. Hashimoto and T. Yoshida and H. Yagi and M. Takizawa and A. Fujimori and M. Kubota and K. Ono and K. Tanaka and D. H. Lu and Z. -X. Shen and S. Ono and Yoichi Ando},
journal= {arXiv preprint arXiv:0801.0782},
year = {2008}
}