Evolution of midgap states and residual three dimensionality in La₂₋ₓSrₓCuO₄
Originally published in Physical Review Letters v. 95 (2005): DOI: 10.1103/PhysRevLett.95.157601
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.
S. Sahrakorpi, M. Lindroos, R. S. Markiewicz, and A. Bansil. "Evolution of midgap states and residual three dimensionality in La₂₋ₓSrₓCuO₄" Physics Faculty Publications (2005).
Available at: http://works.bepress.com/rmarkiewicz/33