Evolution of midgap states and residual three dimensionality in La₂₋ₓSrₓCuO₄

S. Sahrakorpi, Northeastern University
M. Lindroos, Northeastern University
R. S. Markiewicz, Northeastern University
A. Bansil, Northeastern University

Article comments

Originally published in Physical Review Letters v. 95 (2005): DOI: 10.1103/PhysRevLett.95.157601

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.