Hole dynamics and photoemission in a t-J model for SrCu_2(BO_3)_2
Strongly Correlated Electrons
2009-10-31 v1
Abstract
The motion of a single hole in a t-J model for the two-dimensional spin-gap compound SrCu_2(BO_3)_2 is investigated. The undoped Heisenberg model for this system has an exact dimer eigenstate and shows a phase transition between a dimerized and a Neel phase at a certain ratio of the magnetic couplings. We calculate the photoemission spectrum in the disordered phase using a generalized spin-polaron picture. By varying the inter-dimer hopping parameters we find a cross-over between a narrow quasiparticle band regime known from other strongly correlated systems and free-fermion behavior. The hole motion in the Neel-ordered phase is also briefly considered.
Cite
@article{arxiv.cond-mat/9912099,
title = {Hole dynamics and photoemission in a t-J model for SrCu_2(BO_3)_2},
author = {Matthias Vojta},
journal= {arXiv preprint arXiv:cond-mat/9912099},
year = {2009}
}
Comments
4 pages, 3 figs