Quasiparticle photoemission intensity in doped two-dimensional quantum antiferromagnets

TL;DR

This paper calculates the quasiparticle photoemission intensity in doped two-dimensional quantum antiferromagnets using the self-consistent Born approximation, showing strong agreement with experimental data and exact diagonalization results.

Contribution

It introduces a calculation of quasiparticle weight using the self-consistent Born approximation for the $t-J$ and Hubbard models, providing insights into photoemission in doped antiferromagnets.

Findings

Excellent agreement with exact diagonalization results.

Hubbard weight matches photoemission measurements in Sr_2CuO_2Cl_2.

Provides a theoretical framework for understanding quasiparticle intensities.

Abstract

Using the self-consistent Born approximation, and the corresponding wave function of the magnetic polaron, we calculate the quasiparticle weight corresponding to destruction of a real electron (in contrast to creation of a spinless holon), as a funtion of wave vector for one hole in a generalized $t-J$ model and the strong coupling limit of a generalized Hubbard model. The results are in excellent agreement with those obtained by exact diagonalization of a sufficiently large cluster. Only the Hubbard weigth compares very well with photoemission measurements in Sr_2CuO_2Cl_2.