Showing papers by "Hsin Lin published in 2005"

One-band tight-binding model parametrization of the high-Tc cuprates, including the effect of kz-dispersion

Abstract: We discuss the effects of interlayer hopping and the resulting kz dispersion in the cuprates within the framework of the one-band tight-binding model Hamiltonian. Specific forms of the dispersion relations in terms of the in-plane hopping parameters t, t, t, and t and the effective interlayer hopping tz in La2xSrxCuO4 LSCO and Nd2xCexCuO4 NCCO and the added intracell hopping tbi between the CuO2 bilayers in Bi2Sr2CaCu2O8 Bi2212 are presented. The values of the “bare” parameters are obtained via fits with the first-principles local-density-approximation- LDA- based band structures in LSCO, NCCO, and Bi2212. The corresponding “dressed” parameter sets which account for correlation effects beyond the LDA are derived by fitting experimental Fermi surface FS maps and dispersions near the Fermi energy in optimally doped and overdoped systems. The interlayer couplings tz and tbi are found generally to be a substantial fraction of the in-plane hopping t, although the value of tz in NCCO is anomalously small, reflecting absence of apical O atoms in the crystal structure. Our results provide some insight into the issues of the determination of doping from experimental FS maps in Bi2212, the role of intercell coupling in c-axis transport, and the possible correlations between the doping dependences of the binding energies of the Van Hove singularities and various prominent features observed in the angle-resolved photoemission and tunneling spectra of the cuprates.