ARPES spectra of the stripe phase in the 2D t-J model

TL;DR

This study uses exact diagonalization to analyze ARPES spectra in the stripe phase of the 2D t-J model, revealing good agreement with experimental data and theoretical predictions, especially with realistic hopping parameters.

Contribution

It demonstrates how next nearest hopping terms influence stripe formation and quasiparticle dispersion, aligning theoretical spectra with experimental ARPES results.

Findings

Stripe formation is enhanced by t' and t'' hopping terms.

Quasiparticle dispersion matches bond operator theory predictions.

Spectral weight and Fermi surface agree with ARPES data on cuprates.

Abstract

The 2D t-J model with and without t' and t'' hopping-terms is studied by exact diagonalization on a 5 x 4 cluster, which realizes a hole stripe in y-direction in a dimerized singlet background. Next nearest hopping terms with a sign appropriate for hole-doped cuprates enhance the stripe formation. The dispersion of the quasiparticle-peaks in the single-particle spectrum is in good agreement with a simple bond operator theory for hole motion in the spin-Peierls phase, particularly so for realistic values of t' and t''. The resulting spectral weight distribution and Fermi surface agree well with experimental ARPES spectra on La_1.28 Nd_0.6 Sr_0.12 Cu O_4.