Stripe Stability in the Extended t-J Model on Planes and Four-Leg Ladders

TL;DR

This study investigates how extended hopping terms t' and t'' influence stripe stability in the t-J model on planes and ladders, revealing that realistic parameters weaken stripe tendencies, while small positive t' enhances them.

Contribution

The paper provides a detailed analysis of the impact of extended hopping terms on stripe formation in the t-J model, incorporating realistic parameters relevant to cuprates.

Findings

Stripe tendencies weaken with realistic t' and t'' values.

Small positive t' enhances stripe formation.

Results align with experimental observations in cuprates.

Abstract

The tendencies to phase-separation and stripe formation of the t-J model on planes and four-leg ladders have been here reexamined including hole hopping terms t', t'' beyond nearest-neighbor sites. The motivation for this study is the growing evidence that such terms are needed for a quantitative description of the cuprates. Using a variety of computational techniques it is concluded that the stripe tendencies considerably weaken when experimentally realistic t'<0, t''>0 for hole-doped cuprates are considered. However, a small t'>0 actually enhances the stripe formation.