title: Evolution of midgap states and residual three dimensionality in La2-xSrxCuO4.
abstract: We carry out extensive first-principles doping-dependent computations of angle-resolved photoemission (ARPES) intensities in La2-xSrxCuO4 over a wide range of binding energies. Intercell hopping and the associated three dimensionality, which is usually neglected in discussing cuprate physics, is shown to play a key role in shaping the ARPES spectra. Despite the obvious importance of strong coupling effects (e.g., the presence of a lower Hubbard band coexisting with midgap states in the doped insulator), a number of salient features of the experimental ARPES spectra are captured to a surprising extent when kz dispersion is properly included in the analysis.
authors.affiliation: Physics Department, Northeastern University, Boston, Massachusetts 02115, USA.
authors.forename: S
authors.initials: S
authors.lastname: Sahrakorpi
authors.forename: M
authors.initials: M
authors.lastname: Lindroos
authors.forename: R S
authors.initials: RS
authors.lastname: Markiewicz
authors.forename: A
authors.initials: A
authors.lastname: Bansil