S. Sahrakorpi

Influence of the third dimension of quasi-two-dimensional cuprate superconductors on angle-resolved photoemission spectra

Angle-resolved photoemission spectroscopy (ARPES) presents significant simplifications in analyzing strictly two-dimensional (2D) materials, but even the most anisotropic physical systems display some residual three-dimensionality. Here we demonstrate how this third dimension manifests itself in ARPES spectra of quasi-2D materials by considering the example of the cuprate

Role of site selectivity, dimensionality, and strong correlations in angle-resolved photoemission from cuprate superconductors

{\mathrm{Bi}}_{2}{\mathrm{Sr}}_{2}\mathrm{Ca}{\mathrm{Cu}}_{2}{\mathrm{O}}_{8}

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

(Bi2212). The intercell, interlayer hopping, which is responsible for

Angle-resolved photoemission spectra, electronic structure, and spin-dependent scattering in Ni1-xFex Permalloys

{k}_{z}

Paramagnon-induced dispersion anomalies in the cuprates

dispersion of the bands, is found to induce an irreducible broadening to the ARPES line shapes with a characteristic dependence on the in-plane momentum

Site-selectivity properties of the angle-resolved photoemission matrix element in Bi2Sr2CaCu2O8

{k}_{\ensuremath{\Vert}}

First principles simulations of energy and polarization dependent angle-resolved photoemission spectra of Bi2212

. Our study suggests that ARPES line shapes can provide a direct spectroscopic window for establishing the existence of coherent

High-resolution angle-resolved photoemission spectra from Ni(100): Matrix element effects and spin-resolved initial and final state bands

c

Role of kz-dispersion in photoemission from quasi-2D cuprates

-axis conductivity in a material via the detection of this broadening mechanism, and bears on the understanding of 2D to 3D crossover and pseudogap and stripe physics in novel materials through ARPES experiments.

Matrix element and strong electron correlation effects in ARPES from cuprates

We have carried out extensive first-principles computations of angle-resolved photoemission (ARPES) spectra from the cuprate superconductors within the general framework of the local density approximation (LDA). Selected results on Bi2Sr2CaCu2O8 (Bi2212), La2−xSrxCuO4 (LSCO) and Nd2−xCexCuO4 (NCCO) are presented and discussed. Our focus is on understanding how the underlying electronic structure is mapped via the complex process of photoexcitation into the observed ARPES intensities. Effects of the ARPES matrix element and its remarkable selectivity properties with respect to the energy and polarization of the incident photons in exciting a specific state and/or electrons from a particular site in the lattice are clarified. The importance of deviations from perfect two-dimensionality and the associated interlayer couplings in shaping the ARPES spectra of the cuprates is delineated. Our computations explain many salient features of the experimental spectra. Surprisingly, this agreement extends in some cases to the underdoped regime where strong electron correlations are obviously important. We discuss how the LDA-inspired tight-binding parameters can serve as a useful starting point for the treatment of strong coupling effects in the cuprates.