Quasiparticle energy dispersion in doped two dimensional quantum antiferromagnets

TL;DR

This paper investigates the quasiparticle energy dispersion in doped two-dimensional quantum antiferromagnets using the t-t'-t''-J model, comparing computational methods and matching experimental data for high-Tc cuprates.

Contribution

It provides a detailed analysis of quasiparticle dispersion differences between hole and electron doped cuprates and demonstrates quantitative agreement with experimental photoemission data.

Findings

Quasiparticle band maxima differ between hole and electron doping.

The t-t'-t''-J model with three-site hopping reproduces experimental dispersion.

Computational methods show qualitative differences in quasiparticle structures.

Abstract

The quasiparticle dispersion in the one-hole t-t'-t"-J model is studied. Both the finite-size diagonalization and the self-consistent Born approximation calculations have been performed and compared. The quasiparticle band structures in the hole and electron doped high-Tc cuprates are qualitatively different. In the hole doped compounds, the band maxima locate at (pi/2 , pi/2), while in the electron doped compounds the band maxima locate at (pi, 0) and its equivalent points. The angle-resolved photoemission data for the quasiparticle dispersion of Sr_2CuO_2Cl_2 can be quantitatively reproduced using the one band t-t'-t"-J model with the three-site hopping term.