We study the singularities in X-ray absorption spectra of one-dimensional Hubbard and t--J models. We use Boundary Conformal Field Theory and the Bethe Ansatz solutions of these models with both periodic and open boundary conditions to calculate the exponents describing the power-law decay near the edges of X-ray absorption spectra in the case where the core-hole potential has bound states.
@article{arxiv.cond-mat/9702234,
title = {X-ray edge singularity in integrable lattice models of correlated electrons},
author = {Fabian H. L. Essler and Holger Frahm},
journal= {arXiv preprint arXiv:cond-mat/9702234},
year = {2008}
}
Comments
16 pages of revtex, 8 figures, some typos corrected, references added