Pairing on striped $t$-$t'$-$J$ lattices

TL;DR

This study uses density matrix renormalization group methods to investigate how pairing behavior on striped $t$-$t'$-$J$ lattices depends on model parameters, revealing conditions for uniform and anti-phase superconducting states.

Contribution

It provides new insights into the dependence of pairing on $J/t$ and $t'/t$ in striped lattices, highlighting the energy costs of domain walls.

Findings

Pairing depends sensitively on $J/t$ and $t'/t$.

Stripes are easily coupled by pair fields in certain regimes.

Anti-phase domain walls have a small but measurable energy cost.

Abstract

Results are given from a density matrix renormalization group study of pairing on a striped $t$-$t'$-$J$ lattice in the presence of boundary magnetic and pair fields. We find that pairing on a stripe depends sensitively on both $J/t$ and $t'/t$. In the strong-pairing model-parameter regime the stripes are easily coupled by the pair field, and have a uniform phase. There is a small but measurable energy cost to create anti-phase superconducting domain walls.