Hole dynamics and photoemission in a t-J model for SrCu_2(BO_3)_2

Details Hole dynamics and photoemission in a t-J model for SrCu_2(BO_3)_2 Hole dynamics and photoemission in a t-J model for SrCu_2(BO_3)_2

1999-12-07

arxiv.org/abs/cond-mat/9912099v1

Phys. Rev. B 61, 11309 (2000)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figs

Scientific paper

10.1103/PhysRevB.61.11309

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.

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