d_{x^2-y^2} Pair Domain Walls

TL;DR

This study uses density matrix renormalization group methods to analyze d_{x^2-y^2} pair domain walls in the t-J model at 1/8 doping, revealing their structure and pairing behaviors.

Contribution

It demonstrates the formation of d_{x^2-y^2} pair domain walls and explores how external pinning influences pairing correlations in the t-J model.

Findings

Domain walls are composed of d_{x^2-y^2} pairs.

Antiferromagnetic correlations are pi phase shifted across domain walls.

Weakening pinning enhances d_{x^2-y^2} pair-field correlations.

Abstract

Using the density matrix renormalization group, we study domain wall structures in the t-J model at a hole doping of x=1/8. We find that the domain walls are composed of d_{x^2-y^2} pairs and that the regions between the domain walls have antiferromagnetic correlations that are pi phase shifted across a domain wall. At x=1/8, the hole filling corresponds to one hole per two domain wall unit cells. When the pairs in a domain wall are pinned by an external field, the d_{x^2-y^2} pairing response is suppressed, but when the pinning is weakened, d_{x^2-y^2} pair-field correlations can develop.